removed some antislash in yml file

.github/workflows/python-app.yml

@@ -31,12 +31,10 @@ jobs:
         install -r requirements.txt; fi
     - name: Lint with flake8
       run: |
-        # stop the build if there are Python syntax \
-        errors or undefined names
+        # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --select=E9,F63,F7,F82 \
         --show-source --statistics
-        # exit-zero treats all errors as warnings. \
-        The GitHub editor is 127 chars wide
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 \
         --max-line-length=127 --statistics
     - name: Test with pytest # Using --cov=. --cov-report=xml to create a coverage and export it as an xml file