Added ArduinoLog to TravisCI for Tester sketch dependency

Author: blemasle

.travis.yml

@@ -12,6 +12,7 @@ before_install:
   - sudo mv arduino-$ARDUINO_IDE_VERSION /usr/local/share/arduino
   - sudo ln -s /usr/local/share/arduino/arduino /usr/local/bin/arduino
 install:
+ - arduino --install-library "ArduinoLog"
  - ln -s $PWD /usr/local/share/arduino/libraries/$LIBRARY_NAME
 script:
  - arduino --verify --board arduino:avr:uno $PWD/examples/Block/Block.ino