docs: EMCMC

Author: kozistr

docs/changelogs/v3.0.0.md

@@ -17,6 +17,8 @@ Major version is updated! (`v2.12.0` -> `v3.0.0`) (#164)
   * [SAM as an Optimal Relaxation of Bayes](https://arxiv.org/abs/2210.01620)
 * Implement `Schedule-Free` optimizer. (#230, #233)
   * [Schedule-Free optimizers](https://github.com/facebookresearch/schedule_free)
+* Implement `EMCMC`. (#231, #233)
+  * [Entropy-MCMC: Sampling from flat basins with ease](https://www.semanticscholar.org/paper/Entropy-MCMC%3A-Sampling-from-Flat-Basins-with-Ease-Li-Zhang/fd95de3f24fc4f955a6fe5719d38d1d06136e0cd) 
 
 ### Fix