Merge pull request astaxie#1113 from danbaixi/patch-1

Update 05.5.md

Author: astaxie

zh/05.5.md

@@ -42,7 +42,7 @@ import (
 
 func init() {
 	//注册驱动
-	orm.RegisterDriver("mysql", orm.DR_MySQL)
+	orm.RegisterDriver("mysql", orm.DRMySQL)
 	//设置默认数据库
 	orm.RegisterDataBase("default", "mysql", "root:root@/my_db?charset=utf8", 30)
 	//注册定义的model