Add support for Python 3.10

Author: Phylliade

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.6, 3.7, 3.8, 3.9, 3.10]
     steps:
       - uses: actions/checkout@v1
         name: "Checkout branch"