Remove windows which is not functioning

Author: terriko

.github/workflows/pythonapp.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-         os: [ubuntu-latest, windows-latest]
+         os: [ubuntu-latest]
          python: [3.6, 3.7]
     env:
       ACTIONS: 1