ci: drop Python 3.5 and 3.6

Author: jag1g13

.github/workflows/python-package.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
         os: [ubuntu-latest, macos-latest]
 
     runs-on: ${{ matrix.os }}