Gemfile in nanoc-4.3.5 vs Gemfile in nanoc-4.3.6

@@ -41,9 +41,10 @@
   gem 'maruku'
   gem 'mime-types'
   gem 'mustache', '~> 1.0'
   gem 'nokogiri', '~> 1.6'
   gem 'pandoc-ruby'
+  gem 'parallel'
   gem 'pygments.rb', platforms: [:ruby, :mswin]
   gem 'rack'
   gem 'rainpress'
   gem 'rdiscount', '~> 2.2', platforms: [:ruby, :mswin]
   gem 'redcarpet', platforms: [:ruby, :mswin]