Travis builds failing

[KleinCodes]

It looks like Travis builds are failing on:

pip install -r requirements.txt --use-mirrors

I believe --use-mirrors was deprecated and removed. Any thoughts?

Build log here: https://travis-ci.org/urbanairship/python-library/jobs/158311345

[pdxmele]

Thanks for the report! We hadn't been paying attention to the Travis builds recently but we'll get this fixed up with our next release.

[madelgi]

This has been fixed. Thanks again for the report!