go get for Github

Add a "go get" button to GitHub that puts command "go get github.com/user/repo" into clipboard.

You can change the flags in the options of the extension.

It is active only for repositories which contain Go as language.

Usage:
- left click copies the `go get` command to clipboard
- CTRL + left click opens godoc.org for the current repository (or CMD on Mac)
- ALT + left click opens goreportcard.com for the current repository
- SHIFT + left click opens Sourcegraph for the current repository

For searching reasons: golang

Github: https://github.com/dlsniper/ggg