Enable Windows builds

Author: seisman

.github/workflows/ci_tests.yaml

@@ -43,8 +43,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: [3.6, 3.7, 3.8]
-        #os: [ubuntu-latest, macOS-latest, windows-latest]
-        os: [ubuntu-latest, macOS-latest]
+        os: [ubuntu-latest, macOS-latest, windows-latest]
     # environmental variables used in coverage
     env:
       OS: ${{ matrix.os }}