Bump serde_json from 1.0.133 to 1.0.134 (#781)

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.133 to
1.0.134.
<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>v1.0.134</h2>
<ul>
<li>Add <code>RawValue</code> associated constants for literal
<code>null</code>, <code>true</code>, <code>false</code> (<a
href="https://redirect.github.com/serde-rs/json/issues/1221">#1221</a>,
thanks <a
href="https://github.com/bheylin"><code>@​bheylin</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/serde-rs/json/commit/b2a1415aad0c76684c675d13a5746850d275c178"><code>b2a1415</code></a>
Release 1.0.134</li>
<li><a
href="https://github.com/serde-rs/json/commit/9875785f24c30c990942e3412b3feb8f798bb4dc"><code>9875785</code></a>
Tweak wording of NULL/TRUE/FALSE documentation</li>
<li><a
href="https://github.com/serde-rs/json/commit/4aa05b9143ea7ca9c690e874f4c0f4f43cae9716"><code>4aa05b9</code></a>
Merge pull request <a
href="https://redirect.github.com/serde-rs/json/issues/1222">#1222</a>
from dtolnay/rawvalueassoc</li>
<li><a
href="https://github.com/serde-rs/json/commit/f42c7c760b5e38316c6c9090f80a925491889b4b"><code>f42c7c7</code></a>
Move RawValue associated constants into same impl block as public
functions</li>
<li><a
href="https://github.com/serde-rs/json/commit/96576bad53bf404c724927f82b0be358bf7aa561"><code>96576ba</code></a>
Merge pull request <a
href="https://redirect.github.com/serde-rs/json/issues/1221">#1221</a>
from bheylin/add-const-raw-values-for-null-and-bools</li>
<li><a
href="https://github.com/serde-rs/json/commit/4db66fb0b21b3ac1932d35317e9bcdff14b716f3"><code>4db66fb</code></a>
Add <code>'static</code> lifetime to <code>const</code>'s</li>
<li><a
href="https://github.com/serde-rs/json/commit/9c9aa1f380066e0318b829ec4138d1d1b4ef6949"><code>9c9aa1f</code></a>
Add literal 'null', 'true' and 'false' consts to <code>RawValue</code>
struct.</li>
<li>See full diff in <a
href="https://github.com/serde-rs/json/compare/v1.0.133...v1.0.134">compare
view</a></li>
</ul>
</details>
<br />


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