Pin module to Puppet 4.X

Current codebase simply doesn't work with Puppet5. Fixing it is out
of scope for a modulesync.

Author: bastelfreak

Gemfile

@@ -72,7 +72,7 @@ else
   gem 'facter', :require => false, :groups => [:test]
 end
 
-ENV['PUPPET_VERSION'].nil? ? puppetversion = '~> 5.0' : puppetversion = ENV['PUPPET_VERSION'].to_s
+ENV['PUPPET_VERSION'].nil? ? puppetversion = '~> 4.0' : puppetversion = ENV['PUPPET_VERSION'].to_s
 gem 'puppet', puppetversion, :require => false, :groups => [:test]
 
 # vim: syntax=ruby