Gemfile in tdiff-0.3.4 vs Gemfile in tdiff-0.4.0

@@ -7,7 +7,8 @@
   gem 'rubygems-tasks', '~> 0.1'
   
   gem 'rspec', '~> 3.0'
 
   gem 'kramdown'
-  gem 'yard',  '~> 0.9'
+  gem 'redcarpet',  platform: :mri
+  gem 'yard',       '~> 0.9'
 end