Fix error msg in executing 'hubot -c'
Fix error msg in executing 'hubot -c'

according to hubot/docs/index.md

> % mkdir myhubot
> % cd myhubot
> % yo hubot

gregkare/hubot,fstehle/hubot,chadfurman/hubot,voltsdigital/hubot,ooohiroyukiooo/hubot,alucardzhou/hubot,lisb/hubot,Drooids/hubot,ddmng/brazil82-hubot,nandub/hubot,rafaell-lycan/Hubot-X9,blackwellops/hubot,shinvdu/hubot,scboucher/hubot,dopeboy/hubot,fgbreel/hubot,Mattlk13/Hubot,jasonrhodes/botzero,iDTLabssl/hubot,ouadie-lahdioui/hubot,julianromera/hubot,github/hubot,hubotio/hubot,kgrz/hubot,mrb/hubot,codydaig/hubot,mjurczyk/hubot,vkhang55/hubot,taojuntjpp/hubot,hubotio/hubot,joshsobota/hubot,keyvanakbary/hubot,minted/hubot,GrimDerp/hubot,AlexandrPuryshev/hubot,PropertyUX/nubot,hotrannam/hubot,WaleedAshraf/hubot,plated/hubot,CobyR/hubot,skcript/skubot,ClaudeBot/hubot,danielcompton/hubot,craig5/hubot,bgranberry/hubot,pchaigno/hubot,mutewinter/hubot,nandub/hubot,ajschex/hubot,tiagochiavericosta/hubot,lukw00/hubot,sharabash/hubot,leohmoraes/hubot,zvelo/hubot,ykelvis/hubot,jasonkarns/hubot,msound/hubot,kkirsche/hubot,lisb/hubot,limianwang/hubot,decaffeinate-examples/hubot,scboucher/hubot,PropertyUX/nubot,eetuuuu/hubot,lisb/hubot,ajayanandgit/hubot,davidkassa/hubot,cycomachead/hubot,mcanthony/hubot,doudoupower/hubot,sdimkov/hubot,jianchen2580/hubot,jschell/hubot,edorsey/hubot,makii42/hubot,geoffreyanderson/hubot,brodul/hubot,RavenB/hubot,poppingtonic/hubot,howprice/hubot,RiddickSky/hubot,daudich/hubot,wyncode/hubot,mauricionr/hubot,michaelansel/hubot,kristenmills/hubot,Snorlock/hubot,alex-zhang/hubot,decaffeinate-examples/hubot,mujiansu/hubot,mchill/hubot,rlugojr/hubot,github/hubot