Remove Python 3.6

Author: logandk

.github/workflows/tests.yaml

@@ -11,7 +11,6 @@ jobs:
           - { name: "3.9", python: "3.9", os: ubuntu-latest }
           - { name: "3.8", python: "3.8", os: ubuntu-latest }
           - { name: "3.7", python: "3.7", os: ubuntu-latest }
-          - { name: "3.6", python: "3.6", os: ubuntu-latest }
     steps:
       - uses: actions/checkout@v2