Update awesome.yml

.github/workflows/awesome.yml

@@ -7,10 +7,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
-    - name: Set up Ruby 2.6
+    - name: Set up Ruby 2.2
       uses: actions/setup-ruby@v1
       with:
-        ruby-version: 2.6.x
+        ruby-version: 2.2
     - name: Build and test with awesome_bot
       run: |
         gem install awesome_bot