Update README.md

Author: ladyada

README.md

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-# Adafruit ZeroFFT Library [![Build Status](https://travis-ci.org/adafruit/Adafruit_ZeroFFT.svg?branch=master)](https://travis-ci.org/adafruit/Adafruit_ZeroFFT)
+# Adafruit ZeroFFT Library [![Build Status](https://travis-ci.com/adafruit/Adafruit_ZeroFFT.svg?branch=master)](https://travis-ci.com/adafruit/Adafruit_ZeroFFT)
 
 This is an FFT library for ARM cortex M0+ CPUs
 
 Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
 
 Written by Dean Miller for Adafruit Industries.
-MIT license, all text above must be included in any redistribution
+MIT license, all text above must be included in any redistribution