Master fails to build in Travis

[beezly]

Master currently fails to build in Travis. Please see https://travis-ci.org/beezly/beaker-module_install_helper/builds/374325091 (my fork's master branch is an exact copy of this repo's master).

The specific offences are:

beaker-module_install_helper.gemspec:1:12: C: Style/ExpandPathArguments: Use expand_path('lib', __dir__) instead of expand_path('../lib', __FILE__).
lib = File.expand_path('../lib', __FILE__)
           ^^^^^^^^^^^
lib/beaker/module_install_helper.rb:203:1: C: Style/MixinUsage: include is used at the top level. Use inside class or module.
include Beaker::ModuleInstallHelper
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
6 files inspected, 2 offenses detected
RuboCop failed!

[ekohl]

We've migrated to Github Actions and that now passes.