Bump default puppet version in gemfile

Our tests won't run on anything older than 4.6

Author: albertvaka

Gemfile

@@ -4,7 +4,7 @@ group :test do
   gem "rb-inotify", '< 0.10.0' if RUBY_VERSION < '2.2.0'
   gem "public_suffix", "~> 3.0.0"
   gem "listen", "~> 3.0.0"
-  gem "puppet", ENV['PUPPET_VERSION'] || '~> 4.2.0'
+  gem "puppet", ENV['PUPPET_VERSION'] || '~> 4.6.2'
   gem "puppet-lint"
   gem "puppet-syntax"
   gem "puppetlabs_spec_helper"