adding build status back

Author: siddii

README.md

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 ## angular-timer — A simple AngularJS timer directive demonstrating re-usability & interoperability
 
+[![Build Status](https://travis-ci.org/siddii/angular-timer.png)](https://travis-ci.org/siddii/angular-timer)
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 ### Getting Started
 * Download the latest script file - https://raw.github.com/siddii/angular-timer/master/dist/angular-timer.min.js
 * Clone the repo - `[email protected]:siddii/angular-timer.git`