Changelog fixup

Author: rekmarks

CHANGELOG.md

@@ -5,7 +5,6 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
-
 ### Added
 - `isJsonRpcSuccess` and `isJsonRpcFailure` type guard utilities ([#91](https://github.com/MetaMask/json-rpc-engine/pull/91))
 - JSON-RPC ID validation utility and type guard, via `getJsonRpcIdValidator` ([#91](https://github.com/MetaMask/json-rpc-engine/pull/91))