update readme

Author: likun7981

README.md

@@ -12,8 +12,8 @@ $ yarn install(or npm install)
 $ npm start
 ```
 ## Related issue
- [react-hot-loader do not support with async router](https://github.com/gaearon/react-hot-boilerplate/pull/61#issuecomment-218835358)
- [router3 will console a warning with react-hot loader](https://github.com/gaearon/react-hot-loader/issues/249)
+ 1. [react-hot-loader do not support with async router](https://github.com/gaearon/react-hot-boilerplate/pull/61#issuecomment-218835358)
+ 2. [router3 will console a warning with react-hot loader](https://github.com/gaearon/react-hot-loader/issues/249)
 ## License
 
 MIT