Update changelog for 0.3.0

Author: mgeisler

i18n-helpers/CHANGELOG.md

@@ -2,6 +2,22 @@
 
 This lists the most important changes between releases of mdbook-i18n-helpers.
 
+## Version 0.3.0 (2023-11-09)
+
+This release changes how code blocks are treated: we now only extract literal
+strings and comments. Other parts of the code block is ignored. This vastly
+improves the experience when translating books with many code samples. We will
+add [more controls][#76] for this in the future.
+
+> This is a breaking change: if you translate strings and comments in your code
+> blocks, then you should [run `mdbook-i18n-normalize`](i18n-helpers/USAGE.md)
+> to migrate them automatically!
+
+- [#111]: Skip extracting whitespace-only messages.
+- [#109]: Extract only string literals and comments from code blocks.
+- [#100]: Allow formatting in the `SUMMARY.md` file.
+- [#93]: Wrap the source lines like `msgmerge` does.
+
 ## Version 0.2.4 (2023-09-27)
 
 - [#87]: Set the POT-Creation-Date field in newly generated POT files.
@@ -34,7 +50,12 @@ This lists the most important changes between releases of mdbook-i18n-helpers.
 
 First release as a stand-alone crate.
 
+[#111]: https://github.com/google/mdbook-i18n-helpers/pull/111
+[#109]: https://github.com/google/mdbook-i18n-helpers/pull/109
+[#100]: https://github.com/google/mdbook-i18n-helpers/pull/100
+[#93]: https://github.com/google/mdbook-i18n-helpers/pull/93
 [#87]: https://github.com/google/mdbook-i18n-helpers/pull/87
+[#76]: https://github.com/google/mdbook-i18n-helpers/issues/76
 [#75]: https://github.com/google/mdbook-i18n-helpers/pull/75
 [#69]: https://github.com/google/mdbook-i18n-helpers/pull/69
 [#59]: https://github.com/google/mdbook-i18n-helpers/pull/59