Update lint.yaml

.github/workflows/lent.yaml → .github/workflows/lint.yaml

@@ -15,3 +15,15 @@ jobs:
         run: pip install flake8
       - name: Lint with flake8
         run: flake8 .
+  black:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.x'
+      - name: Install black
+        run: pip install black
+      - name: Run black
+        run: black . --check