Gemfile in chars-0.3.0 vs Gemfile in chars-0.3.1

@@ -4,9 +4,11 @@
 
 group :development do
   gem 'rake'
   gem 'rubygems-tasks', '~> 0.2'
   gem 'rspec',          '~> 3.0'
+
   gem 'kramdown'
+  gem 'redcarpet',       platform: :mri
   gem 'yard',           '~> 0.9'
   gem 'yard-spellcheck', require: false
 end