make gemspec file list narrower

Author: igor-makarov

censorius.gemspec

@@ -19,9 +19,8 @@ Gem::Specification.new do |spec|
 
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
-  spec.files = Dir.chdir(File.expand_path(__dir__)) do
-    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{\A(?:test|spec|features)/}) }
-  end
+  spec.files = %w[README.md] + Dir['lib/**/*.rb']
+
   spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']