Merge pull request #429 from phil-r/patch-1

Update travis-ci build badge

README.md

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-# [nickel.rs](http://nickel-org.github.io) [![Build Status](https://travis-ci.org/nickel-org/nickel.rs.png?branch=master)](https://travis-ci.org/nickel-org/nickel.rs) [![](http://meritbadge.herokuapp.com/nickel)](https://crates.io/crates/nickel) [![license](http://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/nickel-org/nickel.rs/master/LICENSE) [![Join the chat at https://gitter.im/nickel-org/nickel.rs](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/nickel-org/nickel.rs?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+# [nickel.rs](http://nickel-org.github.io) [![Build Status](https://travis-ci.org/nickel-org/nickel.rs.svg?branch=master)](https://travis-ci.org/nickel-org/nickel.rs) [![](http://meritbadge.herokuapp.com/nickel)](https://crates.io/crates/nickel) [![license](http://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/nickel-org/nickel.rs/master/LICENSE) [![Join the chat at https://gitter.im/nickel-org/nickel.rs](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/nickel-org/nickel.rs?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 [nickel.rs](http://nickel-org.github.io) is a simple and lightweight foundation for web applications written in Rust. Its API is inspired by the popular express framework for JavaScript.