add yeoman and generator-hubot to devDeps since hubot --create is deprecated
add yeoman and generator-hubot to devDeps since hubot --create is deprecated

hubotio/hubot,lisb/hubot,hubotio/hubot,lisb/hubot,github/hubot,decaffeinate-examples/hubot,PropertyUX/nubot,lisb/hubot,scboucher/hubot,github/hubot,PropertyUX/nubot,nandub/hubot,decaffeinate-examples/hubot,nandub/hubot,scboucher/hubot