GitHub Actions: also test Python 3.13

Author: FelixSchwarz

.github/workflows/tests.yml

@@ -42,7 +42,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.7, 3.8, 3.9, "3.10", "3.11", "3.12", pypy3.9]
+        python-version: [3.7, 3.8, 3.9, "3.10", "3.11", "3.12", "3.13", pypy3.9]
 
     steps:
     - uses: actions/checkout@v4

README.md

@@ -313,7 +313,7 @@ solid piece of software. I wrote yet another library because I wanted
 
 The project uses GitHub Actions to run the test suite. Hopefully this means all
 tested versions are suitable for production.
-At the moment I test Python 3.6-3.12 as well as pypy3 on Linux.
+At the moment I test Python 3.6-3.13 as well as pypy3 on Linux.
 Deployment on Windows is not recommended as all locking will be disabled on
 Windows (due to its inability to delete/move open files) but development on
 a Windows machine should be fine.