Auto merge of #2161 - rust-lang:dependabot/npm_and_yarn/ember-cli-3.15.2, r=locks

Bump ember-cli from 3.15.1 to 3.15.2

Bumps [ember-cli](https://github.com/ember-cli/ember-cli) from 3.15.1 to 3.15.2.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/ember-cli/ember-cli/releases">ember-cli's releases</a>.</em></p>
<blockquote>
<h2>v3.15.2</h2>
<h4>Blueprint Changes</h4>
<ul>
<li><a href="https://github.com/ember-cli/ember-new-output/compare/v3.15.1...v3.15.2"><code>ember new</code> diff</a></li>
<li><a href="https://github.com/ember-cli/ember-addon-output/compare/v3.15.1...v3.15.2"><code>ember addon</code> diff</a></li>
</ul>
<h4>Changelog</h4>
<ul>
<li><a href="https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8924">#8924</a> Fix named UMD imports <a href="https://github.com/kellyselden">@kellyselden</a></li>
<li><a href="https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/9015">#9015</a> Allow failure of Node 8 CI jobs. <a href="https://github.com/rwjblue">@rwjblue</a></li>
<li><a href="https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/9014">#9014</a> Avoid errors when <code>ui</code> is not present and a warning will be emitted. <a href="https://github.com/tmquinn">@tmquinn</a></li>
</ul>
<p>Thank you to all who took the time to contribute!</p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/ember-cli/ember-cli/blob/master/CHANGELOG.md">ember-cli's changelog</a>.</em></p>
<blockquote>
<h2>v3.15.2</h2>
<h4>Blueprint Changes</h4>
<ul>
<li><a href="https://github.com/ember-cli/ember-new-output/compare/v3.15.1...v3.15.2"><code>ember new</code> diff</a></li>
<li><a href="https://github.com/ember-cli/ember-addon-output/compare/v3.15.1...v3.15.2"><code>ember addon</code> diff</a></li>
</ul>
<h4>Changelog</h4>
<ul>
<li><a href="https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8924">#8924</a> Fix named UMD imports <a href="https://github.com/kellyselden">@kellyselden</a></li>
<li><a href="https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/9015">#9015</a> Allow failure of Node 8 CI jobs. <a href="https://github.com/rwjblue">@rwjblue</a></li>
<li><a href="https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/9014">#9014</a> Avoid errors when <code>ui</code> is not present and a warning will be emitted. <a href="https://github.com/tmquinn">@tmquinn</a></li>
</ul>
<p>Thank you to all who took the time to contribute!</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/ember-cli/ember-cli/commit/e17502b45b6f9e337d14fc46e30ae9b2769b8956"><code>e17502b</code></a> 3.15.2</li>
<li><a href="https://github.com/ember-cli/ember-cli/commit/4f1a5bbf92e695c569504e8cb070a84488ed26b5"><code>4f1a5bb</code></a> Add v3.15.2 to CHANGELOG.md.</li>
<li><a href="https://github.com/ember-cli/ember-cli/commit/9e904a97288c219adca35499479c51927a431737"><code>9e904a9</code></a> Avoid errors when <code>ui</code> is not present and a warning will be emi… (<a href="https://github-redirect.dependabot.com/ember-cli/ember-cli/issues/9014">#9014</a>)</li>
<li><a href="https://github.com/ember-cli/ember-cli/commit/e164076b946f12e5c95f8dc64c7abae57b6c143e"><code>e164076</code></a> Supply a more universal .ui</li>
<li><a href="https://github.com/ember-cli/ember-cli/commit/972b3a0a7107f8924c12326fc9a171fd05fd0939"><code>972b3a0</code></a> Allow failure of Node 8 CI jobs. (<a href="https://github-redirect.dependabot.com/ember-cli/ember-cli/issues/9015">#9015</a>)</li>
<li><a href="https://github.com/ember-cli/ember-cli/commit/c89428a4eb439fc9aeeb6c4cdf2dcb1a5e1d0449"><code>c89428a</code></a> Allow failure of Node 8 CI jobs.</li>
<li><a href="https://github.com/ember-cli/ember-cli/commit/dc95c25cacc337fee8350213033bc7d8e7d0c6bc"><code>dc95c25</code></a> fix named UMD imports (<a href="https://github-redirect.dependabot.com/ember-cli/ember-cli/issues/8924">#8924</a>)</li>
<li><a href="https://github.com/ember-cli/ember-cli/commit/bc6d511e3460edbed59b1f810a6f4b0a01b7d22d"><code>bc6d511</code></a> allow importing named UMD files</li>
<li><a href="https://github.com/ember-cli/ember-cli/commit/98d3928f92bf1be0c270a2e880b51580d5256c9b"><code>98d3928</code></a> remove amd-shim duplication</li>
<li>See full diff in <a href="https://github.com/ember-cli/ember-cli/compare/v3.15.1...v3.15.2">compare view</a></li>
</ul>
</details>
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Author: bors