chore: changelog release/19.x (#577)

Author: tac0turtle

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 ## Unreleased
 
+## 0.19.2 (October 6, 2022)
+
+ - [#547](https://github.com/cosmos/iavl/pull/547) Implement `skipFastStorageUpgrade` in order to skip fast storage upgrade and usage. 
+ - [#531](https://github.com/cosmos/iavl/pull/531) Upgrade to fast storage in batches. 
+
 ## 0.19.1 (August 3, 2022)
 
 ### Improvements