Doc: Update changelog

CHANGELOG.md

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 # Changelog
 
+## v0.5.0 (2024-05-28)
+
+[All new commits](https://github.com/princeton-nlp/SWE-agent/compare/v0.4.0...v0.5.0)
+
+✨ The big news is our [brand new documentation](https://princeton-nlp.github.io/SWE-agent/) ✨
+
+Secondly, @ollmer added a new flag `--cache_task_images` that will significantly speed up SWE-agent when running on the same environment/repository multiple times (no more waiting for cloning and installation!)
+
+### Breaking changes
+
+* Remove direct imports in __init__.py (you can no longer `from sweagent import Agent` by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/436
+* We have reformatted our codebase. If you create a PR based on a previous commit, make sure you install our `pre-commit` hook to avoid merge-conflicts because of formatting. See [our docs](https://princeton-nlp.github.io/SWE-agent/dev/contribute/) for more information.
+
+### Features
+
+* Running the web UI is now supported when running swe-agent completely in docker
+* Speed up evaluation by caching task environments as docker images by @ollmer in https://github.com/princeton-nlp/SWE-agent/pull/317
+
+### Improved
+
+* Add gpt-4o model by @raymyers in https://github.com/princeton-nlp/SWE-agent/pull/344
+* Web: Allow to specify commit hash by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/358
+* Add default environment_setup config by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/351
+* Enh: Suppress openai logging; improve formatting of stats by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/416
+* Remove signal dependency by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/428
+* Do not use select if running on Windows by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/429
+* Use custom Config class to support env and keys.cfg (this allows passing keys as environment variables) by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/430
+
+### Fixes
+
+* Web: Fix script_path input by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/334
+* Fix: Don't print patch msg for exit_cost patch by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/343
+* Fix: Do not request job control in bash by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/345
+* Fix: --base_commit not used for gh urls by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/346
+* Fix: Separate data path/traj dir cause exception by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/348
+* Add docker-py lower bound by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/406
+* Fix: IndexError when replaying incomplete trajectories by @klieret in https://github.com/princeton-nlp/SWE-agent/pull/410
+
+
 ## 0.4.0 (2024-05-09)
 
 [All new commits](https://github.com/princeton-nlp/SWE-agent/compare/v0.3.0...v0.4.0)