Remove i3 build in travis... it is to old.
Remove i3 build in travis... it is to old.

jubalh/rofi,eigengrau/rofi,jreinert/rofi,daemonl/rofi,t-wissmann/rofi,ThomasAdam/rofi,carnager/rofi,stettberger/rofi,daemonl/rofi,t-wissmann/rofi,eigengrau/rofi,carnager/rofi,ThomasAdam/rofi,carnager/rofi,jreinert/rofi,jubalh/rofi,stettberger/rofi