Merge pull request #39 from csett86/python-315

Add testing python 3.15

Author: csett86

.github/workflows/tests.yml

@@ -31,6 +31,8 @@ jobs:
             toxenv: py313
           - python-version: "3.14"
             toxenv: py314
+          - python-version: "3.15-dev"
+            toxenv: py315
           - python-version: "3.x"
             toxenv: no-flask-caching
           - python-version: "3.12"