Enable win/py3.5 and 3.6 in CI

Author: davidbrochart

.github/workflows/main.yml

@@ -12,11 +12,6 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         python-version: [ '3.5', '3.6', '3.7', '3.8' ]
-        exclude:
-          - os: windows-latest
-            python-version: '3.5'
-          - os: windows-latest
-            python-version: '3.6'
     steps:
     - name: Checkout
       uses: actions/checkout@v1