Use Gem::Requirement to check versions

Author: indirect

lib/haml-rails.rb

@@ -47,7 +47,7 @@ class Railtie < ::Rails::Railtie
 
       # Configure source annoatation on haml files (support for HAML was
       # provided directly by railties 3.2..4.1 but was dropped in 4.2.
-      if ::Rails.version.to_s >= '4.2'
+      if Gem::Requirement.new(">= 4.2").satisfied_by?(Gem::Version.new(::Rails.version))
         initializer 'haml_rails.configure_source_annotation' do
           SourceAnnotationExtractor::Annotation.register_extensions('haml') do |tag|
             /\s*-#\s*(#{tag}):?\s*(.*)/