Gemfile in combinatorics-0.4.4 vs Gemfile in combinatorics-0.5.0

@@ -5,10 +5,12 @@
 group :development do
   gem 'rake'
   gem 'rubygems-tasks', '~> 0.2'
 
   gem 'rspec',          '~> 3.0'
+  gem 'simplecov',      '~> 0.20', require: false
 
   gem 'kramdown'
+  gem 'redcarpet',       platform: :mri
   gem 'yard',           '~> 0.9'
   gem 'yard-spellcheck', require: false
 end