Move from CGO pebbe/zmq4 to go-zeromq/zmq4
As current implementation uses wrapper around libzmq, which requires GCC compiler and Linux host, there is need to move from it to go-zeromq/zmq4 which is a pure Go implementation of ZeroMQ.
As current implementation uses wrapper around libzmq, which requires GCC compiler and Linux host, there is need to move from it to go-zeromq/zmq4 which is a pure Go implementation of ZeroMQ.