Testing PSON gem

Author: LukasAud

Gemfile

@@ -35,6 +35,7 @@ group :development do
   gem "rubocop-rspec", '~> 2.19',                  require: false
   gem "rb-readline", '= 0.5.5',                    require: false, platforms: [:mswin, :mingw, :x64_mingw]
   gem "github_changelog_generator", '= 1.15.2',    require: false
+  gem "puppet-pson",                               require: false
 end
 group :system_tests do
   gem "puppet_litmus", '< 1.0.0', require: false, platforms: [:ruby, :x64_mingw]