Auto merge of #26528 - servo:dependabot/cargo/http-0.1.21, r=jdm

Bump http from 0.1.20 to 0.1.21

Bumps [http](https://github.com/hyperium/http) from 0.1.20 to 0.1.21.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/hyperium/http/blob/v0.1.21/CHANGELOG.md">http's changelog</a>.</em></p>
<blockquote>
<h1>0.1.21 (December 2, 2019)</h1>
<ul>
<li>Fix <code>Method::is_idempotent</code> returning <code>false</code> for <code>PUT</code> and `DELETE.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="6443bdb307"><code>6443bdb</code></a> v0.1.21</li>
<li><a href="0cbcc1ea56"><code>0cbcc1e</code></a> Fix Method::is_idempotent</li>
<li>See full diff in <a href="https://github.com/hyperium/http/compare/v0.1.20...v0.1.21">compare view</a></li>
</ul>
</details>
<br />

[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=http&package-manager=cargo&previous-version=0.1.20&new-version=0.1.21)](https://dependabot.com/compatibility-score/?dependency-name=http&package-manager=cargo&previous-version=0.1.20&new-version=0.1.21)

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Cargo.lock

@@ -2484,9 +2484,9 @@ dependencies = [
 
 [[package]]
 name = "http"
-version = "0.1.20"
+version = "0.1.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2790658cddc82e82b08e25176c431d7015a0adeb1718498715cbd20138a0bf68"
+checksum = "d6ccf5ede3a895d8856620237b2f02972c1bbc78d2965ad7fe8838d4a0ed41f0"
 dependencies = [
  "bytes",
  "fnv",