update README.

README.md

@@ -8,7 +8,7 @@ SwitchHosts! is an App for managing hosts file, it is based on [Electron](http:/
 
 ## Screenshot
 
-<img src="https://raw.githubusercontent.com/oldj/SwitchHosts/master/assets/capture.png" alt="Capture" width="980" style="border:1px solid #979797;">
+<img src="https://raw.githubusercontent.com/oldj/SwitchHosts/master/screenshots/sh_light.png" alt="Capture" width="960">
 
 
 ## Features

README_cn.md

@@ -8,7 +8,7 @@
 
 ## 截图
 
-<img src="https://raw.githubusercontent.com/oldj/SwitchHosts/master/assets/capture.png" alt="Capture" width="980" style="border:1px solid #979797;">
+<img src="https://raw.githubusercontent.com/oldj/SwitchHosts/master/screenshots/sh_light.png" alt="Capture" width="960">
 
 
 ## 功能特性
@@ -103,6 +103,10 @@ SwitchHosts! 的数据文件在 `~/.SwitchHosts` 目录下（Windows 用户为
 
 ## 更新历史
 
+### v3.4
+
+ - 2019-07-26 发布 v3.4，样式改进，部分细节重新设计，增加【亮色】、【暗色】主题
+
 ### v3.3
 
  - 2017-05-30 引入 [Ant Design](https://ant.design) 重写部分 UI 组件