fix insert phase error

Author: keets2012

zh/05.2.md

@@ -51,7 +51,7 @@ func main() {
 	checkErr(err)
 
 	//插入数据
-	stmt, err := db.Prepare("INSERT userinfo SET username=?,department=?,created=?")
+	stmt, err := db.Prepare("INSERT INTO userinfo SET username=?,department=?,created=?")
 	checkErr(err)
 
 	res, err := stmt.Exec("astaxie", "研发部门", "2012-12-09")