Add CI workflow and update tox.ini to include additional Python versions

.github/workflows/ci.yaml

@@ -0,0 +1,31 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.8, 3.9, 3.10, 3.11]
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v2
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install tox
+
+    - name: Run tests with tox
+      run: tox -e py${{ matrix.python-version }}
+
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v4
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py310
+envlist = py38, py39, py310, py311
 
 [testenv]
 deps = pytest