Add pre-commit hooks

.pre-commit-config.yaml

@@ -0,0 +1,17 @@
+repos:
+  - repo: https://github.com/psf/black
+    rev: 19.10b0
+    hooks:
+      - id: black
+        args:
+          - --safe
+          - --quiet
+        files: ^((blinkpy|tests)/.+)?[^/]+\.py$
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.8.1
+    hooks:
+      - id: flake8
+        additional_dependencies:
+          - flake8-docstrings==1.5.0
+          - pydocstyle==5.0.2
+        files: ^(homeassistant|tests)/.+\.py$

requirements_test.txt

@@ -2,6 +2,7 @@ black==19.10b0
 coverage==5.1
 flake8==3.8.1
 flake8-docstrings==1.5.0
+pre-commit==2.4.0
 pylint==2.5.2
 pydocstyle==5.0.2
 pytest==5.4.1
@@ -9,4 +10,4 @@ pytest-cov==2.8.1
 pytest-sugar==0.9.3
 pytest-timeout==1.3.4
 restructuredtext-lint==1.3.0
-pygments==2.6.1
+pygments==2.6.1