Update dependency chroma-js to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
chroma-js	dependencies	major	^1.3.4 -> ^2.0.0	source

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Release Notes

gka/chroma.js

v2.0.3

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• hsl2rgb will, like other x2rgb conversions now set the default alpha to 1

v2.0.2

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• use a more mangle-safe check for Color class constructor to fix issues with uglifyjs and terser

v2.0.1

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• added chroma.valid() for checking if a color can be parsed by chroma.js

v2.0.0

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• chroma.js has been ported from CoffeeScript to ES6! This means you can now import parts of chroma in your projects!
• changed HCG input space from [0..360,0..100,0..100] to [0..360,0..1,0..1] (to be in line with HSL)
• added new object unpacking (e.g. hsl2rgb({h,s,l}))
• changed default interpolation to lrgb in mix/interpolate and average.
• if colors can't be parsed correctly, chroma will now throw Errors instead of silently failing with console.errors

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