Revert action python versions

Author: aaront

.github/workflows/pythonpackage.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: ['2.x', '3.x']
+        python-version: [2.7, 3.7]
     env:
       MYGEOTAB_DATABASE: ${{ secrets.MYGEOTAB_DATABASE }}
       MYGEOTAB_USERNAME: ${{ secrets.MYGEOTAB_USERNAME }}