Update README.md

Author: jarry

oop-principles/single-responsibility/README.md

@@ -57,7 +57,7 @@ public class OrderProcessor {
         System.out.println("order save to DB.");
         orderDao.saveOrder(orderId);
         // 或则删除订单
-        // orderDao.deleteOrder(orderId);
+        // this.deleteOrder(orderId);
 
         return true;
     }
@@ -187,4 +187,4 @@ public class SingleResponsibility_counter {
 ```
 
 ## 更多语言版本
-面向对象设计原则源码：[https://github.com/microwind/design-pattern/oop-principles](https://github.com/microwind/design-pattern/oop-principles)
+面向对象设计原则源码：[https://github.com/microwind/design-pattern/oop-principles](https://github.com/microwind/design-pattern/oop-principles)