Update .travis.yml

Author: thijse

.travis.yml

@@ -6,7 +6,6 @@
     "export DISPLAY=:1.0",
     "wget http://downloads.arduino.cc/arduino-1.6.9-linux64.tar.xz",
     "tar xf arduino-1.6.9-linux64.tar.xz",
-    "sudo rm /usr/local/share/arduino",
     "sudo ln -s arduino-1.6.9 /usr/local/share/arduino",
     "sudo ln -s /usr/local/share/arduino/arduino /usr/local/bin/arduino"
   ],