Update Python version matrix

Author: foosel

.github/workflows/build.yml

@@ -49,7 +49,7 @@ jobs:
     name: 🧪 Unit tests
     strategy:
       matrix:
-        python: ["2.7", "3.7", "3.8", "3.9"]
+        python: ["3.7", "3.8", "3.9", "3.10"]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3