Update changelog

CHANGELOG.md

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 ## 0.20.0 (unreleased)
 
+- Add `name` annotation for codeblock
+- Add argument to `zola serve` to watch additional directories
+- Disable JS minification when minifying HTML, it can result in broken JS
+- Add external links class option to Markdown configuration
+- Improve accessibility by nesting bottom footnotes inside footer element
+- Add pagination info to sections
+- Exclude paginated pages in sitemap by default
+- Allow treating a missing highlight language as error
+- Handle more editors with change detection in `zola serve`
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 ## 0.19.2 (2024-08-15)
 
 - Fix some of YAML date parsing