Quote python version.
See:
@@ -91,7 +91,7 @@ jobs:
runs-on: windows-latest
strategy:
matrix:
- python: [2.7, 3.5, 3.6, 3.7, 3.8, 3.9, 3.10]
+ python: ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10"]
steps:
- uses: actions/checkout@v2
