.travis.yml: fix.
.travis.yml: fix.

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