Development installation with virtual environment

[jofmi]

Hi everyone,

the readme only shows how to do the development installation in conda.

here is how i managed with virtualenvwrapper in linux, maybe it's worth adding to the readme!

1. Installing npm with yarn:

sudo apt install npm
npm install yarn

2. Creating a virtual environment

mkvirtualenv widget_dev
workon widget_dev

3. Installing the widget and adding the virtual environment as an IPython Kernel:

pip install -e ".[test, examples]"
ipython kernel install --name widget_dev --user

In jupyter lab, one can then select the widget_dev kernel on the top right
In jupyter notebook, under the menu section Kernel

[ianhi]

Hi @JoelForamitti good point thanks!

Would you like to make a PR with changes that you feel would have helped you?

[jofmi]

@ianhi ok, i made a PR here: #95