Drop support for versions 3.6 and 3.7 of python

Author: phillipdupuis

.github/workflows/cicd.yml

@@ -18,12 +18,6 @@ jobs:
         os: [ubuntu-latest, windows-latest, macOS-latest]
         python-version: ["3.8"]
         include:
-          - os: ubuntu-latest
-            python-version: "3.6"
-          - os: ubuntu-latest
-            python-version: "3.7"
-          - os: ubuntu-latest
-            python-version: "3.8"
           - os: ubuntu-latest
             python-version: "3.9"
           - os: ubuntu-latest