update change log and tests for issue #5351

Author: Muhammad-Altabba

CHANGELOG.md

@@ -586,4 +586,7 @@ Released with 1.0.0-beta.37 code base.
 
 ## [Unreleased]
 
-## [1.7.6]
+## [1.7.6]
+
+### Changed
+-  Updated `sha3` and `sha3Raw` type definition to accept `Buffer`

packages/web3-utils/types/tests/sha3-raw-test.ts

@@ -25,7 +25,7 @@ import {sha3Raw} from 'web3-utils';
 
 // $ExpectType string
 sha3Raw('234');
-// $ExpectType string | null
+// $ExpectType string
 sha3Raw(Buffer.from('123'));
 // $ExpectType string
 sha3Raw(new BN(3));