chore: release v0.9.0 (#136)

CHANGELOG.md

@@ -2,6 +2,29 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.9.0] - 2025-01-12
+
+### Changes
+
+- Raise minimum supported Rust version to 1.75 (#135)
+- [**breaking**] Overhaul HTML parsing and Pandoc communication (#137, #140)
+
+  This release completely changes how `mdbook-pandoc` parses Markdown files and how it interacts with Pandoc:
+  - Raw HTML: Instead of processing a stream of HTML tokens, `mdbook-pandoc` now uses a browser-grade HTML parser (`html5ever`) to parse raw HTML and construct a combined Markdown+HTML tree. This lets `mdbook-pandoc` avoid having to think too much about the semantics of HTML (which elements are void vs need closing tags, when elements are implicitly closed, etc.).
+  - Pandoc: Instead of generating preprocessed Markdown (Commonmark + many extensions), generates Pandoc's native format. This avoids ambiguity in parsing preprocessed markdown (previously, the meaning of Markdown in the original source may have changed based on the Pandoc extensions `mdbook-pandoc` enabled) and the difficulty of round-tripping Markdown (`pulldown-cmark-to-cmark` often had subtle differences).
+
+  This may result in worse compatibility with old versions of Pandoc.
+
+
+### Bug Fixes
+
+- Recognize `.latex` and `.ltx` output files as LaTeX (#143)
+
+### Miscellaneous Tasks
+
+- Improve logging when preprocessing a chapter fails (#139)
+
+
 ## [0.8.1] - 2025-01-01
 
 ### Bug Fixes