change slogan

package.json

@@ -2,7 +2,7 @@
   "name": "antd",
   "version": "0.0.1",
   "title": "Ant Design",
-  "description": "下一代设计&前端框架",
+  "description": "下一个设计&前端框架",
   "homepage": "http://ant-design.github.io/",
   "repository": {
     "type": "git",