[scikit-image] Oops - I broke travis-ci build temporarily

[Matthew Brett]

Hi,

Sorry, I've been updating the travis-ci build, and in particular the
wheel sources, over at :

https://github.com/scikit-image/scikit-image/pull/2451

As part of that, I built a new version of the pyside wheel, for our
wheel repository, and this broke one of the current scikit image
travis build matrix entries:

https://travis-ci.org/scikit-image/scikit-image/jobs/191999862

That break will be fixed when #2451 is merged - just letting y'all know.

Cheers,

Matthew