.travis.yml: Drop the offline flag.
.travis.yml: Drop the offline flag.

jakirkham/rank_filter,DudLab/rank_filter,jakirkham/rank_filter,DudLab/rank_filter,DudLab/rank_filter,nanshe-org/rank_filter,nanshe-org/rank_filter,nanshe-org/rank_filter,jakirkham/rank_filter