CI: add Generate.py tests

* allows ModuleUpdate to be run outside of local_dir
* adds windows-latest to the unittest matrix

.github/workflows/unittests.yml

@@ -7,17 +7,20 @@ on: [push, pull_request]
 
 jobs:
   build:
+    runs-on: ${{ matrix.os }}
+    name: Test Python ${{ matrix.python.version }} ${{ matrix.os }}
 
-    runs-on: ubuntu-latest
-    
-    name: Test Python ${{ matrix.python.version }}
     strategy:
       fail-fast: false
       matrix:
+        os: [ubuntu-latest]
         python:
           - {version: '3.8'}
           - {version: '3.9'}
           #- {version: '3.10'}
+        include:
+          - python: {version: '3.9'}
+            os: windows-latest
 
     steps:
     - uses: actions/checkout@v2