Fix travis-ci badge.

README.md

@@ -3,6 +3,7 @@ Utilities often use "smart meters" to optimize their residential meter reading i
 
 This project is a software defined radio receiver for these messages. We make use of an inexpensive rtl-sdr dongle to allow users to non-invasively record and analyze the commodity consumption of their household.
 
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 [![Build Status](http://img.shields.io/travis/bemasher/rtlamr.svg?style=flat)](https://travis-ci.org/bemasher/rtlamr)
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