Implement update_colors

[RustyNixieTube]

No description provided.

[Keavon]

Hi @RustyNixieTube, thanks again for this code contribution to the project! We're still hoping you will respond to the request to relicense this code. Please see #4208 ASAP, thank you!

[Keavon]

Hi @RustyNixieTube, we're grateful of your past code contribution to Graphite, but unless we hear from you by the end of this weekend with agreement about relicensing your code to include the MIT license, we will begin steps to remove your code contributions so that you will no longer be a Graphite code contributor. We'd much rather avoid this outcome, so please respond now.

To agree, simply log into your GitHub account, visit #4208, and copy-paste this into a comment:

"I license my past and future contributions to Graphite under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option."

If you're hesitant because you disagree or have questions, feel free to respond with another message; we'll do our best to answer your questions or concerns. More explanation is at the top of the linked thread if you're confused. So far, 164 contributors have agreed and you are among the 11% remaining whom we are still hoping to hear from before we begin removing your code from the project starting this Monday. (If you only see this later than Monday, your future belated response will still be appreciated.)

Thank you for your cooperation and support of open source, and we hope you'll help us keep your valued contributions in-tact.