Run CI on 3.8-3.13

Author: tusharsadhwani

.github/workflows/tox.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
     name: Python ${{ matrix.python-version }} tests
     steps:
       - uses: actions/checkout@v2