chore(package): update node-xmpp-core to version 5.0.0
chore(package): update node-xmpp-core to version 5.0.0

http://greenkeeper.io/
xmppjs/xmpp.js,ggozad/node-xmpp,node-xmpp/node-xmpp,xmppjs/xmpp.js,node-xmpp/node-xmpp,ggozad/node-xmpp