Add 0.15.1 to changelog (rerun-io#5926)

### What

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)

- [PR Build Summary](https://build.rerun.io/pr/5926)
- [Recent benchmark results](https://build.rerun.io/graphs/crates.html)
- [Wasm size tracking](https://build.rerun.io/graphs/sizes.html)

CHANGELOG.md

@@ -3,7 +3,12 @@
 ## [Unreleased](https://github.com/rerun-io/rerun/compare/latest...HEAD)
 
 
-## [0.15.0](https://github.com/rerun-io/rerun/compare/0.14.1...0.15.0) - Blueprints from Python - 2024-04-**09**
+## [0.15.1](https://github.com/rerun-io/rerun/compare/0.15.1...0.15.0) - Bug fix for notebooks - 2024-04-11
+- Fix timeout in notebooks by making the `app_url` correctly point to `app.rerun.io` [#5877](https://github.com/rerun-io/rerun/pull/5877)
+- CMake: Allow to call `find_package(rerun_sdk)` two or more times [#5886](https://github.com/rerun-io/rerun/pull/5886) (thanks [@traversaro](https://github.com/traversaro)!)
+
+
+## [0.15.0](https://github.com/rerun-io/rerun/compare/0.14.1...0.15.0) - Blueprints from Python - 2024-04-09
 The biggest news is the ability to create a _blueprint_ via the Python logging API. Check out our [associated blog post](https://www.rerun.io/blog/blueprint-part-one) for more information.
 
 ```py