Setup codecov

Author: AlexPetul

.github/workflows/test.yml

@@ -21,3 +21,7 @@ jobs:
         pip install tox tox-gh-actions
     - name: Test with tox
       run: tox run
+    - name: Upload coverage reports to Codecov
+      uses: codecov/[email protected]
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}