Switch project to use black, isort and flake8 (thanks @hanifbirgani)

.pre-commit-config.yaml

@@ -0,0 +1,13 @@
+repos:
+  - repo: https://github.com/pycqa/isort
+    rev: 5.9.3
+    hooks:
+      - id: isort
+  - repo: https://github.com/psf/black
+    rev: 21.8b0
+    hooks:
+      - id: black
+  - repo: https://github.com/pycqa/flake8
+    rev: 3.9.2
+    hooks:
+      - id: flake8

pyproject.toml

@@ -0,0 +1,17 @@
+[tool.black]
+line-length = 79
+include = '\.pyi?$'
+exclude = '''
+/(
+    \.git
+  | \.hg
+  | \.mypy_cache
+  | \.tox
+  | \.venv
+  | activate
+  | _build
+  | buck-out
+  | build
+  | dist
+)/
+'''