Support Python 3.13 in test matrix (#19)

Author: loren

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
+        python-version: [ "3.9", "3.10", "3.11", "3.12", "3.13" ]
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4