Fix according to actions/starter-workflows#636

.github/workflows/python-app.yml

@@ -33,4 +33,10 @@ jobs:
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Analysing the code with pylint
       run: |
-        pylint `ls -R|grep .py$|xargs`
+        pylint --fail-under=10 `find -regextype egrep -regex '(.*.py)$'`
+        | tee pylint.txt
+    - name: Upload pylint.txt as artifact
+      uses: actions/upload-artifact@v2
+      with:
+        name: pylint report
+        path: pylint.txt