Switch to gh actions (#1357)

Switch to gh actions for CI tests

.github/workflows/tests.yml

@@ -0,0 +1,44 @@
+name: CI
+
+on:
+  push:
+    branches: [ 'master', 'release-0-8', 'release-0-9', 'release-0-10' ]
+  pull_request:
+    branches: ['**']
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby:
+          - 2.6.6
+          - 2.7.2
+        rails:
+          - 6.1.1
+          - 6.0.3.4
+          - 5.2.4.4
+          - 5.1.7
+          - 5.0.7.2
+          - 4.2.11
+        exclude:
+          - ruby: 2.7.2
+            rails: 5.0.7.2
+          - ruby: 2.7.2
+            rails: 4.2.11
+          - ruby: 2.6.6
+            rails: 4.2.11
+    env:
+      RAILS_VERSION: ${{ matrix.rails }}
+    name: Ruby ${{ matrix.ruby }} Rails ${{ matrix.rails }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+      - name: Install dependencies
+        run: bundle install --jobs 4 --retry 3
+      - name: Run tests
+        run: bundle exec rake test

jsonapi-resources.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
   spec.required_ruby_version = '>= 2.1'
 
-  spec.add_development_dependency 'bundler', '~> 1.17.3'
+  spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'minitest'
   spec.add_development_dependency 'minitest-spec-rails'