Remove py2.7 in master tests

Author: pgleeson

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [2.7, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
       fail-fast: false
 
     steps: