update CHANGELOG.md

Author: Muhammad-Altabba

packages/web3-eth-contract/CHANGELOG.md

@@ -378,4 +378,5 @@ Documentation:
 
 ### Added
 
--	Add a console warning in case of an ambiguous call to a solidity method with parameter overloading (#6942)
+-	Added a console warning in case of an ambiguous call to a solidity method with parameter overloading (#6942)
+-	Added contract.deploy(...).decodeData(...) and contract.decodeMethodData(...) that decode data based on the ABI (#6950)