Switch to lowercase logrus import

[LukeHandle]

It seems a year or so back github.com/Sirupsen/logrus became github.com/sirupsen/logrus and this caused a bunch of issues with packages when they did not use the same version. The current guideline is:

Everything using logrus will need to use the lower-case: github.com/sirupsen/logrus. Any package that isn't, should be changed.

Thanks!