Merge pull request #63 from inducer/py3.x-in-github-ci

Use Python 3.x in Github CI script

Author: inducer

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                python-version: [3.6, 3.7, 3.8]
+                python-version: ['3.6', '3.7', '3.x']
         steps:
         -   uses: actions/checkout@v2
         -