On OS X ulimit error fix
On OS X ulimit error fix

This fixes the issue seen on startup:

________                      __________
\_____  \ ______   ____   ____\______   \_____  _____________  _____ _______
 /   |   \\____ \_/ __ \ /    \|    |  _/\__  \ \___   /\__  \ \__  \\_  __ \
/    |    \  |_> >  ___/|   |  \    |   \ / __ \_/    /  / __ \_/ __ \|  | \/
\_______  /   __/ \___  >___|  /______  /(____  /_____ \(____  (____  /__|
        \/|__|        \/     \/       \/      \/      \/     \/     \/

OpenBazaar Server v0.13.6
2019/11/21 10:54:14
OpenBazaar Server v0.13.6
error setting ulimit: invalid argument
exit status 1

OpenBazaar/openbazaar-go,OpenBazaar/openbazaar-go,OpenBazaar/openbazaar-go