Fix compatibility with older Node versions
Fix compatibility with older Node versions

* scripts/dowload.js: use ES5
lgeiger/zmq-prebuilt,lgeiger/zmq-prebuilt,interpretor/zeromq.js,lgeiger/zmq-prebuilt,lgeiger/zmq-prebuilt,interpretor/zeromq.js,lgeiger/zmq-prebuilt,interpretor/zeromq.js,interpretor/zeromq.js,interpretor/zeromq.js