Auto merge of #2080 - rust-lang:dependabot/npm_and_yarn/eslint-config-prettier-6.9.0, r=carols10cents

Bump eslint-config-prettier from 6.7.0 to 6.9.0

Bumps [eslint-config-prettier](https://github.com/prettier/eslint-config-prettier) from 6.7.0 to 6.9.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/prettier/eslint-config-prettier/blob/master/CHANGELOG.md">eslint-config-prettier's changelog</a>.</em></p>
<blockquote>
<h3>Version 6.9.0 (2019-12-27)</h3>
<ul>
<li>Added: [vue/max-len]. Thanks to <a href="https://github.com/xcatliu">@xcatliu</a>!</li>
</ul>
<h3>Version 6.8.0 (2019-12-25)</h3>
<ul>
<li>Added: [@typescript-eslint/no-extra-semi]. Thanks to <a href="https://github.com/xcatliu">@xcatliu</a>!</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/prettier/eslint-config-prettier/commits/v6.9.0">compare view</a></li>
</ul>
</details>
<br />

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Author: bors

package-lock.json

@@ -77,7 +77,7 @@
     "ember-web-app": "^3.0.1",
     "ember-window-mock": "^0.5.4",
     "eslint": "^6.8.0",
-    "eslint-config-prettier": "^6.7.0",
+    "eslint-config-prettier": "^6.9.0",
     "eslint-plugin-ember": "^7.7.2",
     "eslint-plugin-prettier": "^3.1.2",
     "faker": "^4.1.0",