Update markdown requirement from =1.0.0-alpha.18 to =1.0.0-alpha.20 (#10

)

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.20</h2>
<ul>
<li>6144c58 Fix padded code (text) in mdast
by <a href="https://github.com/yshavit"><code>@​yshavit</code></a> in <a
href="https://redirect.github.com/wooorm/markdown-rs/pull/123">wooorm/markdown-rs#123</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/wooorm/markdown-rs/compare/1.0.0-alpha.19...1.0.0-alpha.20">https://github.com/wooorm/markdown-rs/compare/1.0.0-alpha.19...1.0.0-alpha.20</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/af3ebbcff48a9c0e990e25299b9c832fd7857650"><code>af3ebbc</code></a>
1.0.0-alpha.20</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/6144c58707164b58fdacacad4bfbde1ffc7ddb1a"><code>6144c58</code></a>
Fix padded code (text) in mdast</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/690a0b1704ac376a4eba25d4f745d711a2cd3ad9"><code>690a0b1</code></a>
1.0.0-alpha.19</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/2c83b0d97475d28000ca3757d0da43327cea6c14"><code>2c83b0d</code></a>
Fix panic on incomplete closing frontmatter fence</li>
<li><a
href="https://github.com/wooorm/markdown-rs/commit/d0788c9caa4b9622999bd24e3c8a34a7c23c02c2"><code>d0788c9</code></a>
Update dev-dependencies</li>
<li>See full diff in <a
href="https://github.com/wooorm/markdown-rs/compare/1.0.0-alpha.18...1.0.0-alpha.20">compare
view</a></li>
</ul>
</details>
<br />


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Cargo.toml

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