Adding python 3.10 to CI. See #294

Author: pitbulk

.github/workflows/python-package.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [2.7,3.5,3.6,3.7, 3.8,3.9]
+        python-version: [2.7,3.5,3.6,3.7, 3.8,3.9,3.10.2]
 
     steps:
     - uses: actions/checkout@v2