(maint) Update Gemfile for xplat best practices
(maint) Update Gemfile for xplat best practices

Update the Gemfile to look similar to what is currently recommended
for cross-platform development by Puppet Labs.

maxgaulhofer/puppet-chocolatey,cregev/puppet-chocolatey,9bryan/puppet-chocolatey,rismoney/puppet-chocolatey,ferventcoder/puppet-chocolatey,ThoughtCrhyme/puppetlabs-chocolatey,korytkoBT/puppet-chocolatey,rismoney/puppet-chocolatey,ThoughtCrhyme/puppetlabs-chocolatey,9bryan/puppet-chocolatey,chocolatey/puppet-chocolatey,cregev/puppet-chocolatey,maxgaulhofer/puppet-chocolatey,idoru78/puppet-chocolatey,chocolatey/puppet-chocolatey,ferventcoder/puppet-chocolatey,korytkoBT/puppet-chocolatey,idoru78/puppet-chocolatey