Merge pull request #288 from phschiele/gh-actions-windows-macos

Inlcude Windows and MacOs tests (fixes #287)

Author: robertmartin8

.github/workflows/main.yml

@@ -10,11 +10,13 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                os: [ubuntu-latest]
-                python-version: [3.6, 3.7, 3.8]
+                os: [ubuntu-latest, windows-latest, macos-latest]
+                python-version: [3.8]
                 include:
-                    - os: [windows-latest, macos-latest]
-                      python-version: 3.8
+                    - os: ubuntu-latest
+                      python-version: 3.6
+                    - os: ubuntu-latest
+                      python-version: 3.7
 
         steps:
             - uses: actions/checkout@v2