* Add Ruby 3.1 to CI
Update Rubocop for recent Rubies
Disable Rubocop run for Rubies before Ruby 2.4
Quote '3.0' in the CI configuration to ensure it loads a 3.0.x Ruby
Set RUBYOPT="--disable_error_highlight" so Ruby 3.1 error matchers pass
* Add CHANGELOG.md entry
* Re-add deleted line from CHANGELOG.md
* Set minimum supported Ruby version to 2.4.
Remove a number of code bits designed to support Rubies below version 2.4
* Bump version. Remove unneeded require from Gemfile. Add require to spec/support file
We have a nice integration spec harness, so let's make sure we use it
when we're working on the gem. I'm making the following changes:
* Make `bundle exec rake` run integration specs, except on Travis.
* Silence a warning in the OmniAuth integration spec that has nothing to
do with Hashie.
* Make Guard run integration specs when appropriate. Now, when you run
all tasks you will run integration specs. Also, if you modify an
integration spec, it will run. Lastly, if you modify anything in `lib`
the integration specs will run.
* Keeps the extra Travis build that only runs integration specs. Travis
didn't like the Rake task that included it and there's extra signal by
doing it this way anyway.
Peter Goldstein