update README

Author: Allenxuxu

README-ZH.md

@@ -28,7 +28,7 @@
 `gev` 只使用极少的 goroutine, 一个 goroutine 负责监听客户端连接，其他 goroutine （work 协程）负责处理已连接客户端的读写事件，work 协程数量可以配置，默认与运行主机 CPU 数量相同。
 
 <div align=center>
-<img src="benchmarks/out/reactor.png" height="230"/>
+<img src="benchmarks/out/reactor.png" height="300"/>
 </div>
 
 ## 性能测试

README.md

@@ -30,7 +30,7 @@ Support custom protocols to quickly and easily build high-performance servers.
 `gev` uses only a few goroutines, one of them listens for connections and the others (work coroutines) handle read and write events of connected clients. The count of work coroutines is configurable, which is the core number of host CPUs by default.
 
 <div align=center>
-<img src="benchmarks/out/reactor.png" height="230"/>
+<img src="benchmarks/out/reactor.png" height="300"/>
 </div>
 
 ## Performance Test