Align chroma-js with Kibana

[jsanz]

Our CI is red because the recent change in Kibana elastic/kibana#244556 pinned chroma-js to a version that is older than ours, hence downgrading our library to align with this PR.

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[elasticmachine]

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[delanni]

@jsanz - even prior to my PR pinning the version, the resolved version within Kibana was 2.4.2 (https://github.com/elastic/kibana/blob/00023f54627f8163bd12d5c0ad0b09c451c0563a/yarn.lock#L17363-L17366)

[jsanz]

@jsanz - even prior to my PR pinning the version, the resolved version within Kibana was 2.4.2 (https://github.com/elastic/kibana/blob/00023f54627f8163bd12d5c0ad0b09c451c0563a/yarn.lock#L17363-L17366)

Yeah, our script only relies on the package.json declarations, and indeed your PR improves our situation, thanks!!

[nickpeihl]

lgtm!