diff --git a/.simplecov b/.simplecov
index 4cc1224..01e2a27 100644
--- a/.simplecov
+++ b/.simplecov
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/Gemfile b/Gemfile
index a740c2a..a8448cc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/LICENSE.txt b/LICENSE.txt
index 3021178..1abff93 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -1,6 +1,6 @@
 (The MIT License)
 
-Copyright (c) 2016-2019 Yegor Bugayenko
+Copyright (c) 2016-2020 Yegor Bugayenko
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the 'Software'), to deal
diff --git a/Rakefile b/Rakefile
index bd9b8f1..0ca55bb 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/bin/xembly b/bin/xembly
index 18beef4..715839f 100755
--- a/bin/xembly
+++ b/bin/xembly
@@ -1,7 +1,7 @@
 #!/usr/bin/env ruby
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/features/step_definitions/steps.rb b/features/step_definitions/steps.rb
index f0a7045..5e6238f 100644
--- a/features/step_definitions/steps.rb
+++ b/features/step_definitions/steps.rb
@@ -1,7 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 TechnoPark Corp.
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/features/support/env.rb b/features/support/env.rb
index 016c413..86cdd79 100644
--- a/features/support/env.rb
+++ b/features/support/env.rb
@@ -1,7 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 TechnoPark Corp.
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/lib/xembly.rb b/lib/xembly.rb
index a51cb36..e34e05b 100644
--- a/lib/xembly.rb
+++ b/lib/xembly.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -29,7 +29,7 @@
 
 # Xembly main module.
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright:: Copyright (c) 2016-2020 Yegor Bugayenko
 # License:: MIT
 module Xembly
   # Get logger.
diff --git a/lib/xembly/add.rb b/lib/xembly/add.rb
index 9ccbabf..34b792b 100644
--- a/lib/xembly/add.rb
+++ b/lib/xembly/add.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/lib/xembly/addif.rb b/lib/xembly/addif.rb
index a8c267f..e2e668a 100644
--- a/lib/xembly/addif.rb
+++ b/lib/xembly/addif.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/lib/xembly/attr.rb b/lib/xembly/attr.rb
index 944ca12..9920466 100644
--- a/lib/xembly/attr.rb
+++ b/lib/xembly/attr.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/lib/xembly/directives.rb b/lib/xembly/directives.rb
index be880fd..7671d0d 100644
--- a/lib/xembly/directives.rb
+++ b/lib/xembly/directives.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/lib/xembly/remove.rb b/lib/xembly/remove.rb
index 9b102f3..a9f1f79 100644
--- a/lib/xembly/remove.rb
+++ b/lib/xembly/remove.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/lib/xembly/set.rb b/lib/xembly/set.rb
index 00f1fdf..83231ee 100644
--- a/lib/xembly/set.rb
+++ b/lib/xembly/set.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/lib/xembly/strict.rb b/lib/xembly/strict.rb
index 27b47ec..57a500f 100644
--- a/lib/xembly/strict.rb
+++ b/lib/xembly/strict.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/lib/xembly/up.rb b/lib/xembly/up.rb
index fa99c9c..0b1398c 100644
--- a/lib/xembly/up.rb
+++ b/lib/xembly/up.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/lib/xembly/version.rb b/lib/xembly/version.rb
index b9b47c0..1b81749 100644
--- a/lib/xembly/version.rb
+++ b/lib/xembly/version.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -22,7 +22,7 @@
 
 # Xembly main module.
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright:: Copyright (c) 2016-2020 Yegor Bugayenko
 # License:: MIT
 module Xembly
   VERSION = '1.0.snapshot'
diff --git a/lib/xembly/xembler.rb b/lib/xembly/xembler.rb
index 7d59631..f930dfe 100644
--- a/lib/xembly/xembler.rb
+++ b/lib/xembly/xembler.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/lib/xembly/xpath.rb b/lib/xembly/xpath.rb
index e873ee0..63ed1e7 100644
--- a/lib/xembly/xpath.rb
+++ b/lib/xembly/xpath.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
diff --git a/test/test__helper.rb b/test/test__helper.rb
index 172342f..dbd62ce 100644
--- a/test/test__helper.rb
+++ b/test/test__helper.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -27,7 +27,7 @@
 
 # Xembly test, parent class.
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright:: Copyright (c) 2016-2020 Yegor Bugayenko
 # License:: MIT
 class XeTest < Minitest::Test
   def matches(xml, xpaths)
diff --git a/test/test_add.rb b/test/test_add.rb
index 79a283a..4b5423d 100644
--- a/test/test_add.rb
+++ b/test/test_add.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -25,7 +25,7 @@
 
 # Xembly::Add tests.
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright:: Copyright (c) 2016-2020 Yegor Bugayenko
 # License:: MIT
 class TestAdd < XeTest
   def test_adds_nodes
diff --git a/test/test_addif.rb b/test/test_addif.rb
index 03a0ca7..a3f7346 100644
--- a/test/test_addif.rb
+++ b/test/test_addif.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -25,7 +25,7 @@
 
 # Xembly::AddIf tests.
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright:: Copyright (c) 2016-2020 Yegor Bugayenko
 # License:: MIT
 class TestAddIf < XeTest
   def test_skips_nodes
diff --git a/test/test_attr.rb b/test/test_attr.rb
index b41d4fc..a61f1d8 100644
--- a/test/test_attr.rb
+++ b/test/test_attr.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -25,7 +25,7 @@
 
 # Xembly::Attr tests.
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright:: Copyright (c) 2016-2020 Yegor Bugayenko
 # License:: MIT
 class TestAttr < XeTest
   def test_sets_attributes
diff --git a/test/test_directives.rb b/test/test_directives.rb
index 4a5904a..6e83df2 100644
--- a/test/test_directives.rb
+++ b/test/test_directives.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -26,7 +26,7 @@
 
 # Xembly::Directives module tests.
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright:: Copyright (c) 2016-2020 Yegor Bugayenko
 # License:: MIT
 class TestDirectives < Minitest::Test
   def test_parses_directives
diff --git a/test/test_remove.rb b/test/test_remove.rb
index 6e9c484..7fc88e9 100644
--- a/test/test_remove.rb
+++ b/test/test_remove.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -25,7 +25,7 @@
 
 # Xembly::Remove tests.
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright:: Copyright (c) 2016-2020 Yegor Bugayenko
 # License:: MIT
 class TestRemove < XeTest
   def test_adds_nodes
diff --git a/test/test_set.rb b/test/test_set.rb
index 3454664..bb68395 100644
--- a/test/test_set.rb
+++ b/test/test_set.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -25,7 +25,7 @@
 
 # Xembly::Set tests.
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright:: Copyright (c) 2016-2020 Yegor Bugayenko
 # License:: MIT
 class TestSet < XeTest
   def test_sets_values
diff --git a/test/test_xembler.rb b/test/test_xembler.rb
index c875e15..a3f67ae 100644
--- a/test/test_xembler.rb
+++ b/test/test_xembler.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -28,7 +28,7 @@
 
 # Xembly::Xembler module tests.
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright:: Copyright (c) 2016-2020 Yegor Bugayenko
 # License:: MIT
 class TestXembler < XeTest
   def test_modifies_xml
diff --git a/test/test_xembly.rb b/test/test_xembly.rb
index a6a9ba8..51f375a 100644
--- a/test/test_xembly.rb
+++ b/test/test_xembly.rb
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -29,7 +29,7 @@
 
 # Xembly main module test.
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright:: Copyright (c) 2016-2020 Yegor Bugayenko
 # License:: MIT
 class TestXembly < XeTest
   def test_basic
diff --git a/xembly.gemspec b/xembly.gemspec
index 1a65d99..e406df0 100644
--- a/xembly.gemspec
+++ b/xembly.gemspec
@@ -1,6 +1,6 @@
 # encoding: utf-8
 #
-# Copyright (c) 2016-2019 Yegor Bugayenko
+# Copyright (c) 2016-2020 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal