remove deprecated function definition
remove deprecated function definition

ggozad/node-xmpp,node-xmpp/node-xmpp,xmppjs/xmpp.js,erulabs/node-xmpp-core,node-xmpp/node-xmpp,xmppjs/xmpp.js,fritx/node-xmpp-core,ggozad/node-xmpp