Setup GitHub actions

Author: rafaelfranca

.github/workflows/tests.yml

@@ -0,0 +1,17 @@
+name: Run tests
+on: [push, pull_request]
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 3.0, head]
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - run: gem uninstall did_you_mean
+    - run: bundle exec thor spec