Update golang.plugin.zsh (#6750)

add alias to cd to $GOPATH, $GOPATH/src, $GOPATH/bin

plugins/golang/golang.plugin.zsh

@@ -188,6 +188,9 @@ alias gofa='go fmt ./...'
 alias gog='go get'
 alias goi='go install'
 alias gol='go list'
+alias gop='cd $GOPATH'
+alias gopb='cd $GOPATH/bin'
+alias gops='cd $GOPATH/src'
 alias gor='go run'
 alias got='go test'
 alias gov='go vet'