docs(changelog): add v0.21.0 release notes and remove unreleased entry (

#3497)

* docs(changelog): add v0.21.0 release notes and remove unreleased entry

* update

.changes/v0.21.0.md

@@ -0,0 +1,19 @@
+## v0.21.0 (2024-12-02)
+
+### Notice
+
+* Due to changes in the indexing format, the `~/.tabby/index` directory will be automatically removed before any further indexing jobs are run. It is expected that the indexing jobs will be re-run (instead of incrementally) after the upgrade.
+
+### Features
+
+* Support connecting to llamafile model backend.
+* Display **Open** / **Closed** state for issues / pull requests in Answer Engine context card.
+* Support deleting the entire thread in Answer Engine.
+* Add rate limiter options for HTTP-powered model backends.
+
+### Fixed and Improvements
+
+* Fixed a panic that occurred when specifying a local model ([#3464](https://github.com/TabbyML/tabby/issues/3464))
+* Add pagination to Answer Engine threads.
+* Fix Vulkan binary distributions.
+* Improve the retry logic for chunk embedding computation in indexing job.

CHANGELOG.md

@@ -5,6 +5,26 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html),
 and is generated by [Changie](https://github.com/miniscruff/changie).
 
+## v0.21.0 (2024-12-02)
+
+### Notice
+
+* Due to changes in the indexing format, the `~/.tabby/index` directory will be automatically removed before any further indexing jobs are run. It is expected that the indexing jobs will be re-run (instead of incrementally) after the upgrade.
+
+### Features
+
+* Support connecting to llamafile model backend.
+* Display **Open** / **Closed** state for issues / pull requests in Answer Engine context card.
+* Support deleting the entire thread in Answer Engine.
+* Add rate limiter options for HTTP-powered model backends.
+
+### Fixed and Improvements
+
+* Fixed a panic that occurred when specifying a local model ([#3464](https://github.com/TabbyML/tabby/issues/3464))
+* Add pagination to Answer Engine threads.
+* Fix Vulkan binary distributions.
+* Improve the retry logic for chunk embedding computation in indexing job.
+
 ## v0.20.0 (2024-11-08)
 
 ### Features