rolled back to black checker

Author: khoroshevskyi

.github/workflows/black_linter.yml

@@ -0,0 +1,13 @@
+name: Lint
+
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - uses: psf/black@stable