travis verify null pointer exception fix

arduino/Arduino#5836

.travis.yml

@@ -5,7 +5,7 @@ before_install:
 install: 
   - source <(curl -SLs https://raw.githubusercontent.com/gyungdal/Flow-measurement/dev/travis_lib_install.sh)
 script:
-  - arduino --verify --board ${BOARD} $HOME/gyungdal/flow-measurement.ino
+  - arduino --upload --board ${BOARD} $HOME/gyungdal/flow-measurement.ino
 notifications:
   email:
     on_success: change

travis_lib_install.sh

@@ -1,9 +1,5 @@
 #!/usr/bin/env bash
 
-"/sbin/start-stop-daemon --start --quiet --pidfile /tmp/custom_xvfb_1.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :1 -ac -screen 0 1280x1024x16"
-sleep 3
-export DISPLAY=:1.0
-
 git clone https://github.com/jarzebski/Arduino-DS3231.git $HOME/arduino_ide/libraries/Arduino-DS3231
 git clone https://github.com/olikraus/u8glib.git $HOME/arduino_ide/libraries/u8glib
 git clone https://github.com/PaulStoffregen/TimerOne.git $HOME/arduino_ide/libraries/TimerOne