update

Author: webpatch

README.md

@@ -1,11 +1,12 @@
 # Elegant JSON Editor
 
+## Preview
+![preivew](https://github.com/webpatch/JSON-Editor-Extension/blob/master/preview/20171123-143428.png?raw=true)
+
 ## Install 
 
 ### Firefox 
 
-![preivew](https://github.com/webpatch/JSON-Editor-Extension/blob/master/preview/20171123-143428.png?raw=true)
- 
 [Go to https://addons.mozilla.org](https://addons.mozilla.org/zh-CN/firefox/addon/elegant-json-editor/)
 
 ### Chrome