lint(Gemfile): Use the new Ruby 1.9 hash syntax

Signed-off-by: Deric Miguel <dmiguel@logicworks.net>

Author: Deric Miguel

Gemfile

@@ -1,14 +1,14 @@
 source ENV['GEM_SOURCE'] || 'https://rubygems.org'
 
-gem 'github_changelog_generator', '~> 1.12.0', :source => 'https://rubygems.org/'
-gem 'rake', :source => 'https://rubygems.org/'
-gem 'rubocop', :source => 'https://rubygems.org/'
-gem 'unf_ext', :source => 'https://rubygems.org/'
+gem 'github_changelog_generator', '~> 1.12.0', source: 'https://rubygems.org/'
+gem 'rake', source: 'https://rubygems.org/'
+gem 'rubocop', source: 'https://rubygems.org/'
+gem 'unf_ext', source: 'https://rubygems.org/'
 
 source 'https://packagecloud.io/cinc-project/stable' do
-  gem "chef-config"
-  gem "chef-utils"
-  gem "cinc-auditor-bin"
-  gem "inspec"
-  gem "inspec-core"
+  gem 'chef-config'
+  gem 'chef-utils'
+  gem 'cinc-auditor-bin'
+  gem 'inspec'
+  gem 'inspec-core'
 end