resolve case insensitive import collision

[zicklam]

Hello Philip,
there is an import collsion while downloading your application via go get:

$ go get github.com/Griesbacher/check_prometheus
../go/src/github.com/griesbacher/check_prometheus/helper/prometheus.go:5:2: case-insensitive import collision: "github.com/griesbacher/check_prometheus/vendor/github.com/griesbacher/check_x" and "github.com/Griesbacher/check_prometheus/vendor/github.com/griesbacher/check_x"

Did you changed your GitHub Username from griesbacher to Griesbacher?

I quick resolved this in your code:

github.com/griesbacher -> github.com/Griesbacher