add linting step

Author: joshuadavidthomas

.github/workflows/ci.yml

@@ -46,9 +46,9 @@ jobs:
         run: |
           python -m pip install -U pip
 
-      - name: Install tox
+      - name: Install tox and coverage packages
         run: |
-          pip install flake8 tox tox-gh-actions 'coverage<5' coveralls
+          pip install tox tox-gh-actions 'coverage<5' coveralls
 
       - name: Run tox and coverage
         run: |
@@ -59,3 +59,20 @@ jobs:
       # - name: Upload coverage to coveralls
       #   run: |
       #     coveralls
+
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python 3.6
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.6'
+
+    - name: Install tox and flake8 packages
+      run: pip install tox tox-gh-actions flake8
+
+    - name: Lint
+      run: tox -e flake8