feat:重构

 <?php
 <?php
-namespace Jiaoyin\Db;
+namespace Jiaoyin;
 
 
 class MysqlCli{
 class MysqlCli{
     public function start(){
     public function start(){

 <?php
 <?php
 
 
-namespace Jiaoyin\Exchange;
+namespace Jiaoyin;
 
 
 class Test {
 class Test {
     public function sayHello() {
     public function sayHello() {