Merge pull request #95 from karldoenitz/feature-v2.0.0

修改readme里面的链接

README.md

@@ -79,7 +79,7 @@ go build main.go
 打开浏览器访问地址```http://127.0.0.1:8888/hello-tigo```，就可以看到<font color=red>Hello Tigo</font>。
 
 # 性能对比
-<img src="https://github.com/karldoenitz/Tigo/blob/master/documentation/chart.png" width="100%" height="300px" alt="性能对比"/> 
+<img src="https://raw.githubusercontent.com/karldoenitz/Tigo/master/documentation/chart.png" width="100%" height="300px" alt="性能对比"/> 
 
 # 文档
 [点击此处](https://github.com/karldoenitz/Tigo/blob/master/documentation/documentation.md)