Merge pull request #296 from microsoft/fix-changelog

fix typo in changelog

Author: vtbassmatt

CHANGELOG.md

@@ -3,7 +3,7 @@ All notable changes to the Azure Pipelines extension will be documented in this
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/). Versioning follows an internal Azure DevOps format that is not compatible with SemVer.
 
-# 1.165.1
+## 1.165.1
 ### Fixed
 - update a few dependencies