Merge pull request umijs#2 from umijs/xiaohuoni-patch-1

Update README.md

Author: sorrycc

README.md

@@ -92,8 +92,6 @@ $ npm run test
 |--------|------|:------:|:------:|:------:|
 | `code` | [Visual Studio Code](https://code.visualstudio.com/) ||||
 | `atom` | [Atom](https://atom.io/) ||||
-| `code` | [Visual Studio Code](https://code.visualstudio.com/) ||||
-| `atom` | [Atom](https://atom.io/) ||||
 | `code-insiders` | [Visual Studio Code Insiders](https://code.visualstudio.com/insiders/) ||||
 | `sublime` | [Sublime Text](https://www.sublimetext.com/) ||||
 | `webstorm` | [WebStorm](https://www.jetbrains.com/webstorm/) ||||