Ao inserir o código _ "github.com/lib/pq" recebo o seguinte erro: could not import github.com/lib/pq (cannot find package "github.com/lib/pq" in any of /usr/local/go/src/github.com/lib/pq (from $GOROOT) /home/igor/go/src/github.com/lib/pq (from $GOPATH))
