Merge #571

571: Bump serde_json from 1.0.69 to 1.0.70 r=thomaseizinger a=dependabot[bot]

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.69 to 1.0.70.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/serde-rs/json/releases">serde_json's releases</a>.</em></p>
<blockquote>
<h2>v1.0.70</h2>
<ul>
<li>Add <code>serde_json::Map::retain</code> method (<a href="https://github-redirect.dependabot.com/serde-rs/json/issues/822">#822</a>, thanks <a href="https://github.com/deankarn"><code>`@​deankarn</code></a>)</li>`
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="a050481b85"><code>a050481</code></a> Release 1.0.70</li>
<li><a href="24f85d2ecf"><code>24f85d2</code></a> Reorder Map::retain to keep keys() and values() adjacent</li>
<li><a href="37da27fc77"><code>37da27f</code></a> Merge pull request 822 from deankarn/master</li>
<li><a href="2e5b990995"><code>2e5b990</code></a> Merge branch 'master' of github.com:deankarn/json</li>
<li><a href="debd7d07fc"><code>debd7d0</code></a> remove duplicate function</li>
<li><a href="9e36f611db"><code>9e36f61</code></a> Update build.rs</li>
<li><a href="68d3b45c97"><code>68d3b45</code></a> fix function signature</li>
<li><a href="29a58a3077"><code>29a58a3</code></a> don't include indexmap retain without BTreeMap retain</li>
<li><a href="eaa1a319c0"><code>eaa1a31</code></a> fix no_btreemap_retain name</li>
<li><a href="09c5892433"><code>09c5892</code></a> test order</li>
<li>Additional commits viewable in <a href="https://github.com/serde-rs/json/compare/v1.0.69...v1.0.70">compare view</a></li>
</ul>
</details>
<br />


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Cargo.lock

@@ -2721,9 +2721,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.69"
+version = "1.0.70"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e466864e431129c7e0d3476b92f20458e5879919a0596c6472738d9fa2d342f8"
+checksum = "e277c495ac6cd1a01a58d0a0c574568b4d1ddf14f59965c6a58b8d96400b54f3"
 dependencies = [
  "indexmap",
  "itoa",