fix doc link (#627)

README.md

@@ -11,7 +11,7 @@
 
 ## Features
 
- See [feature list](doc/src/feature_list) for more information. 
+ See [feature list](doc/src/feature_list.md) for more information. 
 
 ## Setup
 
@@ -47,4 +47,4 @@ DeepASR is provided under the [Apache-2.0 License](./LICENSE).
 
 ## Acknowledgement
 
-We depends on many open source repos. See [References](doc/src/reference.md) for more information.
+We depends on many open source repos. See [References](doc/src/reference.md) for more information.
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README_cn.md

@@ -11,7 +11,7 @@
 
 ## 特性
 
- 参看 [特性列表](doc/src/feature_list)。
+ 参看 [特性列表](doc/src/feature_list.md)。
 
 
 ## 安装
@@ -45,4 +45,4 @@ DeepASR 遵循[Apache-2.0开源协议](./LICENSE)。
 
 ## 感谢
 
-开发中参考一些优秀的仓库，详情参见 [References](doc/src/reference.md)。
+开发中参考一些优秀的仓库，详情参见 [References](doc/src/reference.md)。
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