add IRC channel to readme
add IRC channel to readme

rapid7/rbvmomi,frapposelli/vagrant-rbvmomi,synthead/rbvmomi,vmware/rbvmomi,rlane/rbvmomi,rlane/rbvmomi,logankimmel/rbvmomi,10xEngineer/rbvmomi,omar-infinio/rbvmomi,synthead/rbvmomi,10xEngineer/rbvmomi,frapposelli/vagrant-rbvmomi,rcorrieri/rbvmomi,rapid7/rbvmomi