Add Python 3.10 to the build matrix

Author: lqmanh

.github/workflows/ci-python.yml

@@ -13,7 +13,11 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version:
+          - "3.7"
+          - "3.8"
+          - "3.9"
+          - "3.10"
     steps:
       - name: Check out
         uses: actions/checkout@v2