pump up version to 0.4-dev
pump up version to 0.4-dev

gityf/zkclient,erikdw/zkclient,Parth-Brahmbhatt/zkclient,fpj/zkclient,NBSW/zkclient,fengbaicanhe/zkclient,livvyguo/zkclient,sgroschupf/zkclient,ijuma/zkclient,wgpshashank/zkclient,patilavinash/zkclient