Added support for Go's repository retrieval.

王权利请求将github/fork/brunoga/go-repository-fetch合并到master

Created by: brunoga

Note I am not sure how to do unit tests for this, but I am willing to do those if someone can point me to how to do it. Also I did not update the CHANGELOG as I am not sure where to put the change. Is it under v6.5.0?

合并请求报告