Provide a 'Changelog' link on rubygems.org/gems/spreadsheet #18

	# 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: Ruby

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	test:
	runs-on: ubuntu-latest
	env:
	BUNDLE_PATH: vendor/bundle
	# Using a matrix fails, because /setup-ruby always invokes bundle install without any additional args
	# Fixed by adding not defining the debugger group in the Gemfile
	strategy:
	fail-fast: false
	matrix:
	os: [ ubuntu]
	# https://github.com/ruby/setup-ruby
	ruby: [2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 3.0, jruby, truffleruby, head]
	continue-on-error: ${{ endsWith(matrix.ruby, 'head') \|\| endsWith(matrix.ruby, 'truffleruby') \|\| endsWith(matrix.ruby, 'jruby') }}
	steps:
	- uses: actions/checkout@v2
	- uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby }}
	bundler-cache: true
	- name: Run tests via test/suite.rb
	run: bundle exec ruby test/suite.rb

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