issue_25 actions update

Author: nickmaccarthy

.github/workflows/tests.yaml

@@ -18,8 +18,6 @@ jobs:
       - run: python2 tests.py
   tests-python3:
     runs-on: ubuntu-20.04
-    needs:
-      - tests-python2
     steps:
       - uses: actions/checkout@v2
       - name: install requirements