Run tests on windows in CI

Author: arnaudlimbourg

.github/workflows/ci.yml

@@ -4,9 +4,10 @@ on: [push, pull_request]
 
 jobs:
   python:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
+        os: [ubuntu-latest, windows-latest]
         python-version: ["3.6", "3.7", "3.8", "3.9"]
 
     steps:
@@ -23,4 +24,4 @@ jobs:
 
       - name: Test with pytest
         run: |
-          pytest --cov=transloadit tests
+          pytest --cov=transloadit tests