docs: v3.0.2 changelog

Author: kozistr

docs/changelogs/v3.0.2.md

@@ -5,6 +5,8 @@
 * Implement `WSD` LR Scheduler. (#247, #248)
   * [Warmup-Stable-Decay LR Scheduler](https://arxiv.org/abs/2404.06395)
 * Add more Pytorch built-in lr schedulers. (#248)
+* Implement `Kate` optimizer. (#249, #251)
+  * [Remove that Square Root: A New Efficient Scale-Invariant Version of AdaGrad](https://arxiv.org/abs/2403.02648) 
 
 ### Refactor