Update dependency @artsy/palette to v4.9.1 (#2302)

This PR contains the following updates:

| Package | Type | Update | Change | References |
|---|---|---|---|---|
| @​artsy/palette | devDependencies | patch | [`4.9.0` -> `4.9.1`](https://diff.intrinsic.com/@artsy/palette/4.9.0/4.9.1) | [source](https://togithub.com/artsy/palette) |

See full list of changes [here](https://togithub.com/artsy/palette/compare/v4.9.0...v4.9.1).

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### Release Notes

<details>
<summary>artsy/palette</summary>

### [`v4.9.1`](https://togithub.com/artsy/palette/blob/master/CHANGELOG.md#v491-Wed-Apr-17-2019)

[Compare Source](https://togithub.com/artsy/palette/compare/v4.9.0...v4.9.1)

##### 🐛  Bug Fix

-   `palette-docs`
    -   creates a docs-only <ColorComponent> to allow display of separate colors [#&#8203;377](https://togithub.com/artsy/palette/pull/377) ([@&#8203;mdole](https://togithub.com/mdole))

##### Authors: 1

-   Matt Dole ([@&#8203;mdole](https://togithub.com/mdole))

* * *

</details>

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package.json

@@ -53,7 +53,7 @@
  },
  "devDependencies": {
  "@artsy/auto-config": "0.1.0",
- "@artsy/palette": "4.9.0",
+ "@artsy/palette": "4.9.1",
  "@babel/cli": "^7.0.0",
  "@babel/core": "^7.0.0",
  "@babel/plugin-proposal-class-properties": "^7.0.0",

yarn.lock

@@ -12,10 +12,10 @@
  resolved "https://registry.yarnpkg.com/@artsy/detect-responsive-traits/-/detect-responsive-traits-0.0.4.tgz#933c66db24e70186c20e83017af39794a920ef0e"
  integrity sha512-3LfmVWQdTQLjorlNv02y+qdD3h3RS57M46P/PBlG+nHjzUFtNk2B9NAKPurTzDubjlPYx1FUTH+EPm3ZaoTipg==
 
-"@artsy/[email protected].0":
- version "4.9.0"
- resolved "https://registry.yarnpkg.com/@artsy/palette/-/palette-4.9.0.tgz#668279a49e40dd71f63de7fc6ebd5a7981ef8b52"
- integrity sha512-TwJeG91SQeO9SC4xaCfzPpmN1NEpHdhYccSUuZ7q7iXv+IpBIe+k1WkXzt4rvtwDQYsaZwt9qZUpbXoYJhU5JQ==
+"@artsy/[email protected].1":
+ version "4.9.1"
+ resolved "https://registry.yarnpkg.com/@artsy/palette/-/palette-4.9.1.tgz#ae2807e1e238794f1dfd291dc2b1985f581f6e6e"
+ integrity sha512-JDrIPk+fDEwyWd56SUrtqaqfvf1QOqFg179yVF/Qg3/vI3Cn8epQgi7BYxtzbeQQhSaQZJnp8f/N3f4StPq5Lw==
  dependencies:
  babel-plugin-styled-components "^1.10.0"
  moment "^2.23.0"