[CBR-26] Update CHANGELOG.md

Author: KtorZ

CHANGELOG.md

@@ -12,14 +12,24 @@
   the main thread. This was noticed when the network connection was interrupted, and the reporter
   died when it tried to report over the down network. (CDEC-470 / [PR 3365])
 
-[PR 3365]: https://github.com/input-output-hk/cardano-sl/pull/3365
+[PR 3365]: https://github.com/input-output-hk/cardano-sl/pull/3365 
+
+- Fix misleading example account id (out-of-bound) in the API documentation (CBR-306)
 
 ### Improvements
 
+- Friendly error mistakes from deserializing invalid addresses instead of brutal 500 (CBR-283)
+
+- Add `walletId` to `WalletAlreadyExists` WalletLayerError (CBR-254)
+
+- Small refactor of wallet Errors implementation to be more maintainable (CBR-26)
+
 ### Specifications
 
 ### Documentation
 
+- Make an inventory of existing wallet errors and exceptions (CBR-307)
+
 
 ## Cardano SL 1.3.0