Test on Python 3.13 development releases (#120)

Author: jarrodmillman

.github/workflows/test.yml

@@ -9,7 +9,16 @@ jobs:
       matrix:
         os: [ubuntu, macos, windows]
         python-version:
-          ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy-3.8", "pypy-3.9"]
+          [
+            "3.8",
+            "3.9",
+            "3.10",
+            "3.11",
+            "3.12",
+            "3.13-dev",
+            "pypy-3.8",
+            "pypy-3.9",
+          ]
 
     steps:
       - uses: actions/checkout@v4