Update ci.yml

Author: shankarpandala

.github/workflows/ci.yml

@@ -29,10 +29,15 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Install dependencies
-      run: pip install -U tox-travis
-
-    - name: Run tests
-      run: tox
+        run:
+          python -m pip install --upgrade pip
+          pip install flake8
+      - name: Lint with flake8
+        run:
+          # 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
+          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
 
   deploy:
     runs-on: ubuntu-latest