Update changelog.

Author: jcs090218

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how to structure this file.
 
 
+### 2020-06-30
+
+* Updated `JCS_Webcam` for webcam module.
+* Supplied `JCS_UnityObject` for generic Unity render object.
+* Supplied `JCS_ColliderObject` for generic collider object.
+
 ### 2020-06-26
 
 * Organized source code for better document string.