Puppet lint check for upcase variables

The future parser disallows mixed case variables, so this check implements warnings for them

This plugin was originally authored by Chris Spence. The maintainer preferred that Vox Pupuli take ownership of the module for future improvement and maintenance.

This gem is licensed under the MIT license.

To make a new release, please do:

• Update the version in the puppet-lint-variable_contains_upcase.gemspec file
• Install gems with bundle install --with release --path .vendor
• generate the changelog with bundle exec rake changelog
• Create a PR with it
• After it got merged, push a tag. A github workflow will do the actual release