add images for statuses in Readme

README.md

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 Have you ever had problems with multiple select and empty strings being sent in array params? (see [discussion](http://stackoverflow.com/questions/8929230/why-is-the-first-element-always-blank-in-my-rails-multi-select-using-an-embedde/)). Now you can easily solve that problem by using ParamsPurifier!
 
+[![Build Status](https://travis-ci.org/Azdaroth/params_purifier.svg)](https://travis-ci.org/Azdaroth/params_purifier)
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+[![Gem Version](https://badge.fury.io/rb/params_purifier.svg)](http://badge.fury.io/rb/params_purifier)
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+[![Coverage Status](https://coveralls.io/repos/Azdaroth/params_purifier/badge.png?branch=master)](https://coveralls.io/r/Azdaroth/params_purifier?branch=master)
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 ## Installation
 
 Add this line to your application's Gemfile: