Gemfile in percheron-0.7.6 vs Gemfile in percheron-0.7.7

@@ -5,8 +5,8 @@
 group :test do
   gem 'codeclimate-test-reporter', '~> 0.1', require: false
 end
 
 group :development do
-  gem 'pry-byebug', '~> 3.0',     platforms: [ :ruby_20 ], require: false
+  gem 'pry-byebug', '~> 3.0',     platforms: [ :ruby_20, :ruby_21 ], require: false
   gem 'awesome_print', '~> 1.0',  require: false
 end