Adopt black as code formatting tool. (#85)

* Adopt black as code formatting tool.
* Format zigpy_deconz with black.
* Format tests with black.
* Format setup.py with black.

Author: Adminiuga

.pre-commit-config.yaml

@@ -0,0 +1,12 @@
+repos:
+-   repo: https://github.com/psf/black
+    rev: 19.3b0
+    hooks:
+    -   id: black
+        args:
+          - --safe
+          - --quiet
+-   repo: https://gitlab.com/pycqa/flake8
+    rev: 3.7.8
+    hooks:
+    -   id: flake8

setup.cfg

@@ -0,0 +1,31 @@
+[flake8]
+exclude = .venv,.git,.tox,docs,venv,bin,lib,deps,build
+# To work with Black
+max-line-length = 88
+# W503: Line break occurred before a binary operator
+# E203: Whitespace before ':'
+# D202 No blank lines allowed after function docstring
+ignore =
+    W503,
+    E203,
+    D202
+
+[isort]
+# https://github.com/timothycrosley/isort
+# https://github.com/timothycrosley/isort/wiki/isort-Settings
+# splits long import on multiple lines indented by 4 spaces
+multi_line_output = 3
+include_trailing_comma=True
+force_grid_wrap=0
+use_parentheses=True
+line_length=88
+indent = "    "
+# by default isort don't check module indexes
+not_skip = __init__.py
+# will group `import x` and `from x import` of the same module.
+force_sort_within_sections = true
+sections = FUTURE,STDLIB,INBETWEENS,THIRDPARTY,FIRSTPARTY,LOCALFOLDER
+default_section = THIRDPARTY
+known_first_party = zigpy_deconz,tests
+forced_separate = tests
+combine_as_imports = true

setup.py

@@ -12,12 +12,7 @@
     author="Daniel Schmidt",
     author_email="[email protected]",
     license="GPL-3.0",
-    packages=find_packages(exclude=['*.tests']),
-    install_requires=[
-        'pyserial-asyncio',
-        'zigpy-homeassistant>=0.10.0',
-    ],
-    tests_require=[
-        'pytest',
-    ],
+    packages=find_packages(exclude=["*.tests"]),
+    install_requires=["pyserial-asyncio", "zigpy-homeassistant>=0.10.0"],
+    tests_require=["pytest"],
 )