test with py3.10

Author: jpsca

.github/workflows/run_tests.yml

@@ -20,7 +20,7 @@ jobs:
     name: tests
     strategy:
       matrix:
-        python: ['3.7', '3.8', '3.9']
+        python: ['3.7', '3.8', '3.9', '3.10']
       fail-fast: false
     runs-on: ubuntu-latest
     steps: