Fix readme references to 'version'
Fix readme references to 'version'

boxen/puppet-ruby,dieterdemeyer/puppet-ruby,dieterdemeyer/puppet-ruby,RallySoftware/boxen-ruby,halyard/puppet-ruby,RallySoftware/boxen-ruby,salimane/puppet-ruby,halyard/puppet-ruby,boxen/puppet-ruby,salimane/puppet-ruby