README.md in mb_string-0.1.2 vs README.md in mb_string-0.1.3

@@ -1,7 +1,19 @@
+[![Build Status](http://img.shields.io/travis/rochefort/mb_string.svg?style=flat)](http://travis-ci.org/rochefort/mb_string)
+[![Dependency Status](http://img.shields.io/gemnasium/rochefort/mb_string.svg?style=flat)](https://gemnasium.com/rochefort/mb_string)
+[![Coverage Status](http://img.shields.io/coveralls/rochefort/mb_string.svg?style=flat)](https://coveralls.io/r/rochefort/mb_string)
+[![Code Climate](http://img.shields.io/codeclimate/github/rochefort/mb_string.svg?style=flat)](https://codeclimate.com/github/rochefort/mb_string)
+[![Gem Version](http://img.shields.io/gem/v/mb_string.svg?style=flat)](http://badge.fury.io/rb/mb_string)
+
+
 # mb_string
 
 `mb_string` is extended Ruby string class for dealing multi-byte strings, add `mb_ljust`, `mb_rjust`, `mb_center` and `mb_truncate` methods.  
+
+## Requirements
+
+Ruby versions is earlier than 2.0.
+
 
 ## Installation
 
 Add this line to your application's Gemfile: