Reformat README and add next version notice.

README.md

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 ![NPM Montly Downloads](https://img.shields.io/npm/dm/lang.js.svg)
 [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/rmariuzzo/Lang.js/master/LICENSE)
 
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 ## Installation
 
 Different installation methods:
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  - Bower: `bower install lang.js`
  - Manually: [Download latest release](https://github.com/rmariuzzo/Lang.js/releases/latest)
 
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+[![Are you interested in the next version?](.github/next-version.svg)](https://github.com/rmariuzzo/Lang.js/tree/next)
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 ## Documentation
 
 ### Initialization
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 This method act as an alias of [`choice()`](#choice).
 
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 ## Development
 
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 **[Get help!](https://gitter.im/rmariuzzo/Lang.js)**
 
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 ## Testing
 
 To run the tests use the following commands: