Remove Ruby 2.4 support

.github/workflows/ci.yml

@@ -30,7 +30,6 @@ jobs:
           - 2.7.2
           - 2.6.6
           - 2.5.8
-          - 2.4.10
         appraisal:
           - rails_6_0
           - rails_5_2
@@ -43,7 +42,6 @@ jobs:
         exclude:
           - { ruby: 2.7.2, appraisal: rails_4_2 }
           - { ruby: 2.6.6, appraisal: rails_4_2 }
-          - { ruby: 2.4.10, appraisal: rails_6_0 }
     env:
       DATABASE_ADAPTER: ${{ matrix.adapter }}
       BUNDLE_GEMFILE: gemfiles/${{ matrix.appraisal }}.gemfile

.rubocop.yml

@@ -3,7 +3,7 @@ require:
   - rubocop-rails
 AllCops:
   NewCops: disable
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.5
   Exclude:
     - 'gemfiles/*'
 Bundler/OrderedGems:

README.md

@@ -468,12 +468,14 @@ machine, understanding the codebase, and creating a good pull request.
 
 ## Compatibility
 
-Shoulda Matchers is [tested][travis] and supported against Ruby 2.4+, Rails
+Shoulda Matchers is [tested][travis] and supported against Ruby 2.5+, Rails
 4.2+, RSpec 3.x, and Minitest 5.x.
 
 For Ruby < 2.4 and Rails < 4.1 compatibility, please use [v3.1.3][v3.1.3].
+For Ruby < 3.0 and Rails < 6.1 compatibility, please use [v4.5.1][v4.5.1].
 
 [v3.1.3]: https://github.com/thoughtbot/shoulda-matchers/tree/v3.1.3
+[v4.5.1]: https://github.com/thoughtbot/shoulda-matchers/tree/v4.5.1
 
 ## Versioning
 

shoulda-matchers.gemspec

@@ -36,6 +36,6 @@ Gem::Specification.new do |s|
     'shoulda-matchers.gemspec']
   s.require_paths = ['lib']
 
-  s.required_ruby_version = '>= 2.4.0'
+  s.required_ruby_version = '>= 2.5.0'
   s.add_dependency('activesupport', '>= 4.2.0')
 end

spec/support/tests/command_runner.rb

@@ -150,14 +150,12 @@ def run
       pid = spawn(env, *command, options)
       t = Thread.new do
         loop do
-          begin
-            @command_output += reader.read_nonblock(4096)
-          rescue IO::WaitReadable
-            IO.select([reader])
-            retry
-          rescue EOFError
-            break
-          end
+          @command_output += reader.read_nonblock(4096)
+        rescue IO::WaitReadable
+          IO.select([reader])
+          retry
+        rescue EOFError
+          break
         end
       end
       Process.waitpid(pid)