Update README.md

Author: yuji

README.md

@@ -29,17 +29,18 @@ require.async([
 ], function(echarts) {
     var ec = echarts.init(el);
     ec.setOption({});
+});
 ```
 
-## DEV
+## DEVELOP
 
 - install deps
 
 ```bash
 $ npm i -g bower gulp; npm i
 ```
 
-- update & build
+- update & rebuild
 
 ```bash
 $ gulp