Bad URL link in contributing guidelines

[DavidKershaw]

In https://github.com/plotly/plotly.py/blob/master/doc/contributing.md
it says
"Want to improve the plotly documentation?
Thank you! Instructions on how to contribute to the documentation are given here. Please also read the next section if you need to setup a development environment."
Clicking on "here" takes you to
https://github.com/plotly/plotly.py/blob/master/doc/contributing.md
404 Page not found - GitHub.

[nicolaskruchten]

Thanks for letting us know... fixed!