Drop support for Ruby 2.0, 2.1, 2.2, 2.3, and 2.4 #140

	name: test on CI
	on:
	push:
	branches: [master]
	pull_request:
	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	ruby: ["2.5", "2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "3.4", "head"]
	steps:
	- uses: actions/checkout@v4
	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby }}
	bundler-cache: true
	- name: Run tests
	run: bundle exec rake test:units
	env:
	RUBYOPT: ${{ startsWith(matrix.ruby, 'head') && '--enable=frozen-string-literal' \|\| '' }}

	test-all:
	runs-on: ubuntu-latest
	needs: test
	if: always()
	steps:
	- name: All tests ok
	if: ${{ !(contains(needs.*.result, 'failure')) }}
	run: exit 0
	- name: Some tests failed
	if: ${{ contains(needs.*.result, 'failure') }}
	run: exit 1

	rubocop:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: "2.7"
	bundler-cache: true
	- name: Run rubocop
	run: bundle exec rake lint

	functional:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	ruby: ["2.5", "ruby"]
	steps:
	- uses: actions/checkout@v4
	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby }}
	bundler-cache: true
	- name: Run functional tests
	run: bundle exec rake test:functional

	functional-all:
	runs-on: ubuntu-latest
	needs: [functional]
	if: always()
	steps:
	- name: All tests ok
	if: ${{ !(contains(needs.*.result, 'failure')) }}
	run: exit 0
	- name: Some tests failed
	if: ${{ contains(needs.*.result, 'failure') }}
	run: exit 1

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