Import of github.com/prometheus/log is deprecated and breaks dep in projects that already use logrus

[mattb]

https://github.com/prometheus/log is deprecated and currently redirects to https://github.com/prometheus-junkyard/log but this package is imported by subscription_provider.go:

https://github.com/pdf/golifx/blob/master/common/subscription_provider.go#L6

Because of an issue with logrus - sirupsen/logrus#451 - this causes dependency problems with projects that already import logrus. Due to the deprecation of prometheus/log it looks like that project won't fix it. It looks like github.com/prometheus/common/log is the correct import now.

[pdf]

That should absolutely not be imported there, looks like goimports screwed me (due to fat fingers).