add black workflow, change our code formats. closes #43

.github/workflows/black.yml

@@ -0,0 +1,25 @@
+name: Lint
+
+on: [push]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+
+      - name: Setup Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.8
+
+      - name: install black
+        run: pip install black
+
+      - name: run linter
+        uses: wearerequired/lint-action@v1
+        with:
+          black: true
+          black_args: ". --line-length 120"
+          auto_fix: true