Auto merge of #26577 - servo:dependabot/cargo/slab-0.4.2, r=jdm

Bump slab from 0.4.1 to 0.4.2

Bumps [slab](https://github.com/carllerche/slab) from 0.4.1 to 0.4.2.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/carllerche/slab/blob/master/CHANGELOG.md">slab's changelog</a>.</em></p>
<blockquote>
<h1>0.4.2 (January 11, 2019)</h1>
<ul>
<li>Add <code>Slab::drain</code> (<a href="https://github-redirect.dependabot.com/carllerche/slab/issues/56">#56</a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/carllerche/slab/commit/e6b8676a1526f9eed997c9f4db82386ba33e007c"><code>e6b8676</code></a> Old rust versions only have build</li>
<li><a href="https://github.com/carllerche/slab/commit/128eb298b42af8fe72bfba522eac581a1029d29e"><code>128eb29</code></a> Only <code>check</code> on older Rust versions</li>
<li><a href="https://github.com/carllerche/slab/commit/9a327e709241788e4840ef0358eac495f122323d"><code>9a327e7</code></a> Fix cargo fmt</li>
<li><a href="https://github.com/carllerche/slab/commit/0bcfd5344dbf6d33adeb9aa3e37e9c5ff303883c"><code>0bcfd53</code></a> Fix CI</li>
<li><a href="https://github.com/carllerche/slab/commit/7802cb946096dbdb26f2819971f892ec6b631d13"><code>7802cb9</code></a> Bump version to v0.4.2</li>
<li><a href="https://github.com/carllerche/slab/commit/a0c2d19c672dc3479a84a66e1ecb76c43ed091d4"><code>a0c2d19</code></a> Deny unreachable-pub</li>
<li><a href="https://github.com/carllerche/slab/commit/9c114f0ca0b0ef6ba6fc5b0b90e3ebd7d5bf7db7"><code>9c114f0</code></a> Implement drain iterator (<a href="https://github-redirect.dependabot.com/carllerche/slab/issues/56">#56</a>)</li>
<li><a href="https://github.com/carllerche/slab/commit/208c40c59ef0cb9c95b7898f36d17e02937ad71b"><code>208c40c</code></a> Apply rustfmt 1.0.0 (<a href="https://github-redirect.dependabot.com/carllerche/slab/issues/57">#57</a>)</li>
<li>See full diff in <a href="https://github.com/carllerche/slab/compare/v0.4.1...v0.4.2">compare view</a></li>
</ul>
</details>
<br />

[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=slab&package-manager=cargo&previous-version=0.4.1&new-version=0.4.2)](https://dependabot.com/compatibility-score/?dependency-name=slab&package-manager=cargo&previous-version=0.4.1&new-version=0.4.2)

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