travis: group: deprecated-2017Q4 to keep using sudo and the "fast version" of the images.
travis: group: deprecated-2017Q4 to keep using sudo and the "fast version" of the images.

it seems linux is timing out after the recent travisci changes.

mrjbq7/factor,AlexIljin/factor,AlexIljin/factor,factor/factor,bpollack/factor,factor/factor,AlexIljin/factor,mrjbq7/factor,mrjbq7/factor,bpollack/factor,tgunr/factor,factor/factor,AlexIljin/factor,AlexIljin/factor,tgunr/factor,bpollack/factor,bpollack/factor,factor/factor,factor/factor,AlexIljin/factor,mrjbq7/factor,bpollack/factor,bpollack/factor,tgunr/factor,bpollack/factor,tgunr/factor,factor/factor,tgunr/factor,tgunr/factor,AlexIljin/factor,mrjbq7/factor,mrjbq7/factor