Update markdown requirement from =1.0.0-alpha.20 to =1.0.0-alpha.21 (#11

)

Updates the requirements on
[markdown](https://github.com/wooorm/markdown-rs) to permit the latest
version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/wooorm/markdown-rs/releases">markdown's
releases</a>.</em></p>
<blockquote>
<h2>1.0.0-alpha.21</h2>
<ul>
<li>fa8f906 2a322c6 4ad5342 6bd4f63 08d6764 d0893f4 Fix serde, change
<code>BlockQuote</code> -&gt; <code>Blockquote</code>
by <a href="https://github.com/h7kanna"><code>@​h7kanna</code></a> in <a
href="https://redirect.github.com/wooorm/markdown-rs/pull/135">wooorm/markdown-rs#135</a>,
by <a href="https://github.com/h7kanna"><code>@​h7kanna</code></a> in <a
href="https://redirect.github.com/wooorm/markdown-rs/pull/140">wooorm/markdown-rs#140</a>,
by <a href="https://github.com/h7kanna"><code>@​h7kanna</code></a> in <a
href="https://redirect.github.com/wooorm/markdown-rs/pull/142">wooorm/markdown-rs#142</a></li>
<li>5f781cd Fix flow JSX adjacent to expressions
by <a href="https://github.com/begleynk"><code>@​begleynk</code></a> in
<a
href="https://redirect.github.com/wooorm/markdown-rs/pull/138">wooorm/markdown-rs#138</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/wooorm/markdown-rs/compare/1.0.0-alpha.20...1.0.0-alpha.21">https://github.com/wooorm/markdown-rs/compare/1.0.0-alpha.20...1.0.0-alpha.21</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/a2ef7562fbd81d659ee798baf36695ffa27b0f12"><code>a2ef756</code></a>
1.0.0-alpha.21</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/2a322c66066000ef6045c9d157117326a97a3ef2"><code>2a322c6</code></a>
Fix typo</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/d0893f4012636d61904df7dcb30f0abd86c99867"><code>d0893f4</code></a>
Fix serde of table align</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/4ad5342156cf5f5256fc452c4583be99a3e80412"><code>4ad5342</code></a>
Rename hidden field, refactor some code</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/6bd4f63bd0a74e9fa97b751c7440d39c36cf19b2"><code>6bd4f63</code></a>
Fix compilation without serde feature</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/68761502b2885c470cbe962d878464e5d1419268"><code>6876150</code></a>
Fix typo</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/08d6764db12aeef82dfd1da2691f5c12e1b30ead"><code>08d6764</code></a>
Add serde tests</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/5f781cdbf08801706479032d22c6c4fb64dc6c7d"><code>5f781cd</code></a>
Fix flow JSX adjacent to expressions</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/fa8f9060d25f568cae0765d17870073ec6c05ea8"><code>fa8f906</code></a>
Fix serde, change <code>BlockQuote</code> -&gt;
<code>Blockquote</code></li>
<li>See full diff in <a
href="https://github.com/wooorm/markdown-rs/compare/1.0.0-alpha.20...1.0.0-alpha.21">compare
view</a></li>
</ul>
</details>
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Cargo.toml

@@ -18,7 +18,7 @@ exclude = [
 chrono = "0.4"
 indexmap = "2"
 lazy_static = "1"
-markdown = "=1.0.0-alpha.20"
+markdown = "=1.0.0-alpha.21"
 regex = "1"
 semver = "1"
 thiserror = "1"