Update tests.yml

.github/workflows/tests.yml

@@ -22,7 +22,7 @@ jobs:
           pip install flake8 pytest cython
           pip install aiohttp==3.8.1
           pip install pyyaml
-          python setup.py develop
+          python -m pip install -e .
       - name: Test with pytest
         run: |
           pytest tests/