update version testing

Author: grburgess

.github/workflows/build_test.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        python-version: [3.7, 3.8, 3.9]
+        python-version: [3.8, 3.9, '3.10']
 
     steps:
     - uses: actions/checkout@v2