Homebrew/homebrew — pull request #34878 by r-medina (2014-12-11 09:13:44+00:00)
Title: Update go.rb

golang changed url where they store tool installations.

running what the current version says yields:
```
> go get code.google.com/p/go.tools/cmd/godoc
can't load package: the code.google.com/p/go.tools/cmd/godoc command has moved; use golang.org/x/tools/cmd/godoc instead.
```