Add pre-commit

.pre-commit-config.yaml

@@ -0,0 +1,6 @@
+repos:
+  - repo: https://github.com/psf/black
+    rev: 20.8b1
+    hooks:
+      - id: black
+        types: [python]

Pipfile

@@ -5,11 +5,12 @@ name = "pypi"
 
 [packages]
 responder = {editable = true, path = "."}
+pre-commit = "*"
 
 [dev-packages]
 pytest = "*"
 "flake8" = "*"
-black = "*"
+black = "==20.8b1"
 twine = "*"
 flask = "*"
 sphinx = "*"

pyproject.toml

@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta:__legacy__"