try macos/windows CI (#12)

Author: wumpus

.github/workflows/ci.yaml

@@ -9,7 +9,7 @@ on:
     - main
 
 jobs:
-  unit-tests:
+  tests:
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -22,6 +22,23 @@ jobs:
           - python-version: '3.7'
             os: ubuntu-20.04  # oldest version on github actions
             EXTRA: true
+          - python-version: '3.11'
+            os: macos-latest
+            EXTRA: true
+          - python-version: '3.13'
+            os: macos-latest
+            EXTRA: true
+          #- python-version: '3.7'
+          #  os: windows-latest
+          #  EXTRA: true
+          #  env:
+          # this doesn't actually work
+          #    PYTHONIOENCODING: "utf8"
+          #- python-version: '3.13'
+          #  os: windows-latest
+          #  EXTRA: true
+          #  env:
+          #    PYTHONIOENCODING: "utf8"
 
     steps:
       - name: checkout