Update README.md

Changed Travis CI button to be correct url

Author: Jordan Parker

README.md

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 Public analytics as a Node.js microservice, no sysadmin experience required.
 
-[![Build Status](https://travis-ci.org/mxstbr/micro-analytics.svg?branch=master)](https://travis-ci.org/mxstbr/micro-analytics)
+[![Build Status](https://travis-ci.org/micro-analytics/micro-analytics.svg?branch=master)](https://travis-ci.org/micro-analytics/micro-analytics)
 
 A tiny analytics server with ~100 lines of code, easy to run and hack around on. It does one thing, and it does it well: count the views of something and making the views publicly accessible via an API.