Update python-app.yml

Author: mifth

.github/workflows/python-app.yml

@@ -36,4 +36,4 @@ jobs:
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with pytest
       run: |
-        simple_encoder_decoder.py
+        python simple_encoder_decoder.py