Change Travis-CI badge to only show master status

I've also updated the link to the suggested format from Travis-CI
mongo-js · Feb 3, 2015 · 536c14e · 536c14e
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commit 536c14e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -5,7 +5,7 @@ It wraps [mongodb-native](https://github.com/mongodb/node-mongodb-native/) and i
 
 	npm install mongojs
 
-[![build status](https://secure.travis-ci.org/mafintosh/mongojs.png)](http://travis-ci.org/mafintosh/mongojs)
+[![Build Status](https://travis-ci.org/mafintosh/mongojs.svg?branch=master)](https://travis-ci.org/mafintosh/mongojs)
 [![Tips](https://img.shields.io/gratipay/mafintosh.svg)](https://gratipay.com/mafintosh)
 
 ## Usage