Remove 3.5 testing.

Author: Carreau

.github/workflows/ci-osx.yaml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.5", "3.6", "3.7", "3.8"]
+        python-version: ["3.6", "3.7", "3.8"]
 
     steps:
       - name: Checkout source