mark travis/push-balto.sh as executable (#4347)
mark travis/push-balto.sh as executable (#4347)

related to https://github.com/i3/i3/issues/4340
stapelberg/i3,Airblader/i3-original,Airblader/i3-original,i3/i3,Airblader/i3,Airblader/i3-original,Airblader/i3-original,Airblader/i3,i3/i3,stapelberg/i3,i3/i3,Airblader/i3,stapelberg/i3,Airblader/i3-original,stapelberg/i3,Airblader/i3,i3/i3