Update CHANGELOG

CHANGELOG.md

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+
 # Changelog
 
 ## [Unreleased]
 
+## [v0.3.0]
+
 ### Features
-[\#253] Add a new validator vesting account type, which releases coins on a periodic vesting schedule based on if a specific validator signed sufficient pre-commits. If the validtor didn't sign enough pre-commits, the vesting coins are burned or sent to a return address.
+
+[\#253] Add a new validator vesting account type, which releases coins on a periodic vesting schedule based on if a specific validator signed sufficient pre-commits. If the validator didn't sign enough pre-commits, the vesting coins are burned or sent to a return address.
 [\#260] Pin to cosmos-sdk commit #18de630 (tendermint 0.32.6)
 
-
 ### Improvements
+
 [\#257] Include scripts to run large-scale simulations remotely using aws-batch