adding Python 3.10 for build

Author: rafaelfsilva

.github/workflows/build.yml

@@ -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" ]
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}