Update dep @artsy/palette from 4.17.11 to v4.17.12

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@artsy/palette	dependencies	patch	4.17.11 -> 4.17.12

See full list of changes here.

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Release Notes

artsy/palette

### [`v4.17.12`](https://togithub.com/artsy/palette/blob/master/CHANGELOG.md#v41712-Thu-Oct-03-2019) [Compare Source](https://togithub.com/artsy/palette/compare/v4.17.11...v4.17.12) ##### 🐛 Bug Fix - `@artsy/palette` - Minor clean up. [#​599](https://togithub.com/artsy/palette/pull/599) ([@​oxaudo](https://togithub.com/oxaudo)) ##### Authors: 1 - Oksana ([@​oxaudo](https://togithub.com/oxaudo)) * * *

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