Fixing logrus and adding comments

[depado]

See sirupsen/logrus#451 for details.
It is now recommended to not use the uppercase version of sirupsen/logrus but instead always use the lowercase.
Also, from the README.md of the logrus project :

Seeing weird case-sensitive problems? It's in the past been possible to import Logrus as both upper- and lower-case. Due to the Go package environment, this caused issues in the community and we needed a standard. Some environments experienced problems with the upper-case variant, so the lower-case was decided. Everything using logrus will need to use the lower-case: github.com/sirupsen/logrus. Any package that isn't, should be changed.

I also fixed a few comments.

[natefinch]

👍 Apologies for requiring this re-patch. This is the correct import now.

[zsais]

Thanks for that catch @depado 👍