github-actions: add codecov upload

Author: miri64

.github/workflows/tox.yml

@@ -22,3 +22,7 @@ jobs:
         pip install tox tox-gh-actions
     - name: Test with tox
       run: tox
+    - name: Upload to coverage
+      uses: codecov/codecov-action@v1
+      with:
+        flags: ${{ matrix.python-version }}

tox.ini

@@ -24,7 +24,7 @@ deps =
     pytest
     pytest-cov
 commands =
-    pytest
+    pytest --cov=./
 
 [testenv:lint]
 deps =