Add black pre-commit

.pre-commit-config.yaml

@@ -0,0 +1,10 @@
+default_language_version:
+  python: 3.9.5
+
+repos:
+-   repo: https://github.com/ambv/black
+    rev: 22.3.0
+    hooks:
+    - id: black
+      args:
+        - --config=pyproject.toml

requirements-dev.txt

@@ -1,6 +1,7 @@
 black==22.3.0
 coverage[toml]==6.4.1
 mypy==0.961
+pre-commit==2.20.0
 pytest==7.1.2
 pytest-asyncio==0.18.3
 pytest-env==0.6.2