drop Python2.7 from github workflow

Author: a-detiste

.github/workflows/build-status.yml

@@ -15,8 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        # <=2.6 and 2.8 isn't available: https://github.com/actions/python-versions/blob/main/versions-manifest.json
-        python-version: ['2.7', '3.x']
+        python-version: ['3.x']
 
     steps:
     - uses: actions/checkout@v2