Golang home directory is `go` instead of `golang`

[bfodeke]

When 'borrowing' your dotfiles setup, I noticed that wuzz didn't work and I think it's because the GOPATH should actually be export GOPATH=$HOME/go instead of export GOPATH=$HOME/golang

Link https://github.com/shrop/dotfiles/blob/master/zsh/zshrc.symlink#L123