.github/workflows/main.yml in belated-0.6.7 vs .github/workflows/main.yml in belated-0.7.0

@@ -7,10 +7,10 @@
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest]
         # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
-        ruby: [2.6, 2.7, '3.0']
+        ruby: [2.7, '3.0']
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1