Remove python 3.5 tests

Author: foster999

.github/workflows/tests.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8]
+        python-version: [3.6, 3.7, 3.8]
         os: [ubuntu-latest]
         include:
           - os: windows-latest