update readme

Author: dabeng

README.md

@@ -1,6 +1,6 @@
 ![OrgChart](http://dabeng.github.io/OrgChart/img/orgchart-heading.png)
 
-##### It's a simple and direct organization chart plugin. Anytime you want a tree-like chart, you can turn to OrgChart.
+#### It's a simple and direct organization chart plugin. Anytime you want a tree-like chart, you can turn to OrgChart.
 
 ## Foreword
 - First of all, thanks a lot for [wesnolte](https://github.com/wesnolte)'s great work:blush: -- [jOrgChart](https://github.com/wesnolte/jOrgChart). The thought that using nested tables to build out the tree-like orgonization chart is amazing. This idea is more simple and direct than its counterparts based on svg.