Revert "only run travis on master and stable"
Revert "only run travis on master and stable"

This reverts commit 43e6e5361be3662e60786ea2b4244129badd9b1a.

lovell/libvips,jcupitt/libvips,lovell/libvips,lovell/libvips,jcupitt/libvips,lovell/libvips,jcupitt/libvips,jcupitt/libvips