Fix typo in readme workflow

Author: amontanez24

.github/workflows/readme.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12, '3.13']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
         os: [ubuntu-latest, macos-latest]
     steps:
     - uses: actions/checkout@v1