use correct path

Author: brentru

.travis.yml

@@ -16,6 +16,7 @@ before_install:
    - pwd
    - cd $HOME/arduino_ide/libraries/
    - wget https://github.com/adafruit/nina-fw/archive/master.zip && unzip master.zip && rm master.zip
+   - cd /home/travis/build/adafruit/Adafruit_IO_Arduino
 
 install:
     - arduino --install-library "Adafruit IO Arduino","Adafruit MQTT Library","ArduinoHttpClient"