Problem: changelog not updated for v3 release (#629)

Solution: updated an entry for v3.0.0

CHANGELOG.md

@@ -1,14 +1,15 @@
 # Changelog
 
-*August 13, 2021*
+*August 23, 2021*
 
-## v3.0.0-croeseid
-This version is meant for the future testnet. It is based on IBC 1.0 and Cosmos SDK 0.43.0 which 
+## v3.0.0
+This version is meant for the "Draco II" mainnet upgrade to enable easier native token issuance via IBC solo machines. It is based on IBC 1.0 and Cosmos SDK 0.43.0 which 
 contain several new features (such as the feegrant and authz modules), bug fixes (such as the vesting account bug fix)
 and breaking changes. For more details, please see the [Cosmos SDK](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.43.0)
 and [ibc-go](https://github.com/cosmos/ibc-go/releases/tag/v1.0.0) release notes.
-*WARNING*: DO NOT upgrade to this binary on the existing testnets yet; instructions are going to be published later
-on https://crypto.org/docs/getting-started/.
+In addition to that, it also uses Tendermint v0.34.12.
+*WARNING*: DO NOT upgrade to this binary yet; instructions are going to be published later
+on https://crypto.org/docs/getting-started/upgrade_guide.html .
 
 *August 6, 2021*