Override license detection for go-license-detector
Override license detection for go-license-detector

Somewhat ironically, our tooling is not able to detect the license of
the go-license-detector project, which Gitaly is about to use for its Go
port of the license detection implementation.

Declare that the project is using an Apache license to fix the issue.

gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab