changelog fix

Author: Wesley201

com.unity.perception/CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this package will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-##[0.2.0.preview.1] - 2020-07-02
+## [0.2.0.preview.1] - 2020-07-02
 ### Added
 Added CameraLabeler, an extensible base type for all forms of dataset output from a camera.
 Added LabelConfig\<T\>, a base class for mapping labels to data used by a labeler. There are two new derived types - ID label config and semantic segmentation label config.