Gemfile in mixlib-versioning-1.1.0 vs Gemfile in mixlib-versioning-1.2.1

@@ -1,8 +1,8 @@
-source 'https://rubygems.org'
+source "https://rubygems.org"
 gemspec
 
 group :docs do
-  gem 'yard',          '~> 0.8'
-  gem 'redcarpet',     '~> 2.2'
-  gem 'github-markup', '~> 0.7'
+  gem "yard",          "~> 0.8"
+  gem "redcarpet",     "~> 2.2"
+  gem "github-markup", "~> 0.7"
 end