fix README

Author: andeya

README.md

@@ -64,8 +64,8 @@ It can be used for peer-peer, rpc, gateway, micro services, push services, game
 
 | version | status  | branch                                   |
 | ------- | ------- | ---------------------------------------- |
-| v4      | pre-release | [v3](https://github.com/henrylee2cn/teleport/tree/v4) |
-| v3(master)      | release | [v3](https://github.com/henrylee2cn/teleport/tree/master) |
+| v4      | pre-release | [v4](https://github.com/henrylee2cn/teleport/tree/v4) |
+| v3      | release | [master(or v3)](https://github.com/henrylee2cn/teleport/tree/master) |
 | v2      | release | [v2](https://github.com/henrylee2cn/teleport/tree/v2) |
 | v1      | release | [v1](https://github.com/henrylee2cn/teleport/tree/v1) |
 

README_ZH.md

@@ -64,8 +64,8 @@ Teleport是一个通用、高效、灵活的Socket框架。
 
 | 版本   | 状态      | 分支                                       |
 | ---- | ------- | ---------------------------------------- |
-| v4      | pre-release | [v3](https://github.com/henrylee2cn/teleport/tree/v4) |
-| v3(master)      | release | [v3](https://github.com/henrylee2cn/teleport/tree/master) |
+| v4      | pre-release | [v4](https://github.com/henrylee2cn/teleport/tree/v4) |
+| v3      | release | [master(or v3)](https://github.com/henrylee2cn/teleport/tree/master) |
 | v2      | release | [v2](https://github.com/henrylee2cn/teleport/tree/v2) |
 | v1      | release | [v1](https://github.com/henrylee2cn/teleport/tree/v1) |