Run new Rubies (3.1..3.3) in CI #16

	# This workflow uses actions that are not certified by GitHub.
	# They are provided by a third-party and are governed by
	# separate terms of service, privacy policy, and support
	# documentation.
	# This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
	# For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby

	name: Build

	on: [push, pull_request]

	jobs:
	test:

	runs-on: ubuntu-latest
	strategy:
	matrix:
	ruby-version: [2.5, 2.6, 2.7, '3.0', 3.1, 3.2, 3.3]

	steps:
	- uses: actions/checkout@v2
	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby-version }}
	bundler-cache: true # runs 'bundle install' and caches installed gems automatically
	- name: Run tests
	run: bundle exec rake

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