coverage.yml in hanny-0.2.1

- old
+ new

@@ -10,12 +10,13 @@
   coverage:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - name: Set up Ruby 2.7
-        uses: actions/setup-ruby@v1
+        uses: ruby/setup-ruby@v1
         with:
           ruby-version: '2.7'
+          bundler-cache: true
       - name: Build and test with Rake
         run: |
           gem install bundler
           bundle install
           bundle exec rake