Test with python 3.11

.github/workflows/ci.yml

@@ -8,11 +8,14 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [ "3.10", "3.11" ]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
         with:
-          python-version: "3.10"
+          python-version: ${{ matrix.python-version }}
       - name: Install project
         run: |
           pip install -U "pip>=21.3.1"