Added ChangeLog file prior to 0.4.2 release
Added ChangeLog file prior to 0.4.2 release

KlausKeidel/ruby-nats,aforward/ruby-nats,derekcollison/ruby-nats,nats-io/ruby-nats,wallyqs/ruby-nats,usutani/nats,wallyqs/ruby-nats,derekcollison/ruby-nats,nats-io/ruby-nats,kkas/nats