Ruby 3.0 Support & CI Actions improvement (#124)

* Ruby 3.0 Support & CI Actions improvement

- Relax Ruby version constraint with `'>= 2.4', '< 3.1'`;
- CI now runs with multiple versions of Ruby, using a matrix strategy;
  - Currently runs on 2.6, 2.7 and 3.0 (previously was only running on 2.6)
- Replaced the `bundle install` step with `bundler-cache: true`
  - As shown on https://github.com/ruby/setup-ruby#caching-bundle-install-automatically

* Include all versions declared as supported on the strategy matrix

Co-authored-by: Alexander Popov <alex.wayfer@gmail.com>

* Use  '>= 2.4', '< 4' as the required ruby version

Co-authored-by: Alexander Popov <alex.wayfer@gmail.com>

* Update .github/workflows/ruby.yml

Co-authored-by: Alexander Popov <alex.wayfer@gmail.com>

Co-authored-by: Alexander Popov <alex.wayfer@gmail.com>
Co-authored-by: Tom Hu <thomasrockhu@users.noreply.github.com>

Author: 3 people

.github/workflows/ruby.yml

@@ -5,14 +5,21 @@ on: [push, pull_request]
 jobs:
   test:
     runs-on: ubuntu-latest
-
+    strategy:
+      matrix:
+        ruby:
+          - 2.4
+          - 2.5
+          - 2.6
+          - 2.7
+          - 3.0
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.6
-    - name: Install dependencies
-      run: bundle install
+        ruby-version: ${{ matrix.ruby }}
+        # Runs 'bundle install' and caches installed gems automatically
+        bundler-cache: true
     - name: Run tests
       run: bundle exec rake

.travis.yml

@@ -8,5 +8,6 @@ rvm:
   - 2.5
   - 2.6
   - 2.7
+  - 3.0
   - jruby
   - jruby-9.2

codecov.gemspec

@@ -12,7 +12,7 @@ Gem::Specification.new do |s|
   s.homepage              = 'https://github.com/codecov/codecov-ruby'
   s.license               = 'MIT'
   s.platform              = Gem::Platform::RUBY
-  s.required_ruby_version = '~> 2.4'
+  s.required_ruby_version = '>= 2.4', '< 4'
   s.version               = ::Codecov::VERSION
 
   s.add_dependency 'simplecov', '>= 0.15', '< 0.21'