Add Python 3.11 to GitHub workflow.

Author: jonathanslenders

.github/workflows/test.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, "3.10"]
+        python-version: [3.7, 3.8, 3.9, "3.10", "3.11"]
 
     steps:
       - uses: actions/checkout@v2