feat: check code style on pre-commit hook

Author: mariobuikhuizen

.pre-commit-config.yaml

@@ -0,0 +1,10 @@
+repos:
+  -   repo: https://github.com/psf/black
+      rev: 21.8b0
+      hooks:
+        - id: black
+          language_version: python3.8
+  -   repo: https://gitlab.com/pycqa/flake8
+      rev: 3.9.2
+      hooks:
+        - id: flake8

README.md

@@ -20,7 +20,7 @@ For a development installation (requires npm),
 
     $ git clone https://github.com/mariobuikhuizen/ipyvue.git
     $ cd ipyvue
-    $ pip install -e .
+    $ pip install -e .[dev]
     $ jupyter nbextension install --py --symlink --sys-prefix ipyvue
     $ jupyter nbextension enable --py --sys-prefix ipyvue
     $ jupyter labextension develop . --overwrite