README: Fix typo in example code (apache#5136)

dbolkensteyn · lovepoem · commit 041aa39c825c · 2019-10-04T20:49:36.000+08:00
diff --git a/README.md b/README.md
@@ -66,7 +66,7 @@ There's a [README](https://github.com/apache/dubbo-samples/tree/master/dubbo-sam
 package org.apache.dubbo.samples.api;
 
 public interface GreetingService {
-    String sayHello(String name);
+    String sayHi(String name);
 }
 ```
 

Original file line number	Diff line number	Diff line change
`@@ -66,7 +66,7 @@ There's a [README](https://github.com/apache/dubbo-samples/tree/master/dubbo-sam`
`66`	`66`	`package org.apache.dubbo.samples.api;`
`67`	`67`
`68`	`68`	`public interface GreetingService {`
`69`		`- String sayHello(String name);`
	`69`	`+ String sayHi(String name);`
`70`	`70`	`}`
`71`	`71`	```
`72`	`72`