Merge pull request #112 from mrkn/macos_on_github_actions

Enable macos on GitHub Actions

Author: mrkn

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
       matrix:
         os:
         - ubuntu-18.04
-        #- macos-latest
+        - macos-latest
         ruby_version:
         - 2.7.x
         - 2.6.x