Update CHANGELOG for 3.0.4

Author: bessman

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## [3.0.4] - 2025-01-05
+
+### Fixed
+
+- Fix ACKSTAT missing from response in several I2C commands ([`6356eb2`](https://github.com/fossasia/pslab-firmware/commit/6356eb2656f856327c9090bcbd6e404db78ae2f0)) (Alexander Bessman)
+
 ## [3.0.3] - 2024-08-19
 
 ### Fixed
@@ -27,6 +33,7 @@
 
 _Major refactorization of firmware._
 
+[3.0.4]: https://github.com/fossasia/pslab-firmware/releases/tag/3.0.4
 [3.0.3]: https://github.com/fossasia/pslab-firmware/releases/tag/3.0.3
 [3.0.2]: https://github.com/fossasia/pslab-firmware/releases/tag/3.0.2
 [3.0.1]: https://github.com/fossasia/pslab-firmware/releases/tag/3.0.1