Update README.md

Author: dmitry-zaets

README.md

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-# redux-actions-assertions
+# redux-actions-assertions [![Build Status](https://travis-ci.org/dmitry-zaets/redux-actions-assertions.svg?branch=master)](https://travis-ci.org/dmitry-zaets/redux-actions-assertions)
 
 Assertions for redux actions testing
 
 This library add assertions for [redux actions](http://redux.js.org/docs/advanced/AsyncActions.html) testing.  
 It use [redux-mock-store](https://github.com/arnaudbenard/redux-mock-store) to mock redux store.
 
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 ## Supported Assertion Frameworks/Libraries:
 - [expect](#expect)
 - [chai](#chai)