Parentheses in Sankey node ids break link colors

[JonathanPicques]

Describe/explain the bug
Using parentheses in Sankey node ids break links colors (almost identical to #623)

To Reproduce
https://codesandbox.io/s/awesome-sunset-kkhyn

Steps to reproduce the behavior:

1. Remove parentheses line 20, 25 & 26: the colors work
2. Add back parentheses line 20, 25 & 26: the colors won't work anymore

Expected behavior
Custom colors should continue to render even when using parentheses in ids

Screenshots
Working without parentheses

Broken with parentheses

[wyze]

Feel free to send a PR if you would like!

[JonathanPicques]

@wyze would love too! is there somewhere a guide to start contributing? never used lerna/storybook so I'm a bit lost

[wyze]

We have the https://github.com/plouc/nivo/blob/master/CONTRIBUTING.md you can follow, but it should be a few steps to get started. Clone/fork the repo, then run make init then grab a coffee, hah!, then make storybook and it will launch storybook in dev mode. Then feel free to make your changes and Storybook should reflect them automatically.