Most of this was done while trying to get 2.2 and 2.3 working, but doesn't feel directly related to those efforts so a separate PR.
Removes some files that aren't needed, including Gemfile.lock that prevents older versions of Ruby from working. Removes the bundler version from the gemspec for the same reasons. Removes rubocop when running tests locally in Docker, it's not needed so we don't need to install it.
Most of this was done while trying to get 2.2 and 2.3 working, but doesn't feel directly related to those efforts so a separate PR.
Removes some files that aren't needed, including Gemfile.lock that prevents older versions of Ruby from working. Removes the bundler version from the gemspec for the same reasons. Removes rubocop when running tests locally in Docker, it's not needed so we don't need to install it.