Update CHANGELOG for 1.5.3 release

Author: spacesailor24

CHANGELOG.md

@@ -432,8 +432,6 @@ Released with 1.0.0-beta.37 code base.
 - Remove transaction `type` defaulting for `eth.sendTransaction`, `eth.sendRawTransaction` (#4241)
 - `type: 0x0` was being added to legacy transaction when using `eth.signTransaction` (#4241)
 
-## [Unreleased]
-
 ## [1.5.3]
 
 ### Fixed
@@ -447,4 +445,8 @@ Released with 1.0.0-beta.37 code base.
 - lerna from 3.22.1 to 4.0.0 (#4231)
 - Dropped build tests in CI for Node v8 and v10, and added support for Node v14
 - Change default value for `maxPriorityFeePerGas` from `1 Gwei` to `2.5 Gwei` (#4284)
-- Fixed bug in signTransaction (#4295) 
+- Fixed bug in signTransaction (#4295)
+
+## [Unreleased]
+
+## [1.5.4]