bump dat-core to 2.4.0 for message support
bump dat-core to 2.4.0 for message support

captainsafia/dat,LinusU/dat,FLGMwt/dat,rjsteinert/dat,mcanthony/dat,waldoj/dat,eayoungs/dat,jqnatividad/dat,vfulco/dat,RichardLitt/dat,yetone/dat,stamhe/dat,flyingzumwalt/dat,delkyd/dat,mattknox/dat,maxogden/dat,adriagalin/dat