Update changelog

Author: dliuproduction

CHANGELOG.md

@@ -1,7 +1,21 @@
-## 4.0.1
+## 0.4.1
 
 - Removed Linkify, added markdown support for response messages
 (urls still are detected automatically but not emails, to ensure
 a link appears use markdown syntax)
 - Fixed fullScreenMode prop: now dispatches the initPayload 
-when the component mounts, removed border-radius
+when the component mounts, removed border-radius
+
+## 0.4.2
+
+- Added a image size property to widget initialization, in order
+to crop-scale images returned by bot.
+- Images are crop-scaled to the defined size by the CSS property
+{object-fit: cover}. The content is sized to maintain its aspect 
+ratio while filling the element’s entire content box. If the 
+object's aspect ratio does not match the aspect ratio of its box
+then the object will be clipped to fit. The clipping will be taken
+from the center.
+- `WebChat.toggle()`, `WebChat.open()`, and `WebChat.close` can be used to change the state of the chat box to open or closed.
+- `WebChat.show()` and `WebChat.hide()` can be used to show or hide the entire chat widget.
+- `WebChat.isOpen()` and `WebChat.isVisible()` can be used to get the open state of the chat box and the visibility state of the entire widget.