(maint) fix .travis.yml for Ruby 2.1.5 / Puppet 4
(maint) fix .travis.yml for Ruby 2.1.5 / Puppet 4
Iristyle/puppetlabs-powershell,jpogran/puppetlabs-powershell,MelanieGault/puppetlabs-powershell,jpogran/puppetlabs-powershell,cpharishnec/powershell,puppetlabs/puppetlabs-powershell,kjhenner/puppetlabs-powershell,ferventcoder/puppetlabs-powershell,cyberious/puppetlabs-powershell,rismoney/puppetlabs-powershell,DSI-Ville-Noumea/puppetlabs-powershell