update syntax in contributing.md
update syntax in contributing.md

ykusumi/test-hubot,kristenmills/hubot,ToriTomyuTomyu/nothing-yet,edorsey/hubot,chadfurman/hubot,andrewpong/awp-hubot,julianromera/hubot,kkirsche/hubot,mjurczyk/hubot,kgrz/hubot,tiagochiavericosta/hubot,ToriTomyuTomyu/nothing-yet,PopExpert/hubot,hubotio/hubot,jschell/hubot,github/hubot,eetuuuu/hubot,alexchenfeng/hubot,wieden-kennedy/hubot,michaelansel/hubot,markstory/hubot,PropertyUX/nubot,wyncode/hubot,hcxiong/hubot,keyvanakbary/hubot,mchill/hubot,doudoupower/hubot,krahman/hubot,hubotio/hubot,mauricionr/hubot,ddmng/brazil82-hubot,poppingtonic/hubot,nandub/hubot,PropertyUX/nubot,mujiansu/hubot,Drooids/hubot,github/hubot,alexchenfeng/hubot,fstehle/hubot,msound/hubot,alexchenfeng/hubot,geoffreyanderson/hubot,makii42/hubot,jianchen2580/hubot,yujiroarai/hws-hubot,hotrannam/hubot,shinvdu/hubot,markstory/hubot,ouadie-lahdioui/hubot,howprice/hubot,alexchenfeng/hubot,alucardzhou/hubot,ykelvis/hubot,sdimkov/hubot,bradparks/hubot__github_chat_bot,lisb/hubot,minted/hubot,pchaigno/hubot,sharabash/hubot,lisb/hubot,limianwang/hubot,andrewpong/awp-hubot,danielcompton/hubot,decaffeinate-examples/hubot,Snorlock/hubot,Mattlk13/Hubot,awbauer/hubot,ajayanandgit/hubot,ooohiroyukiooo/hubot,vkhang55/hubot,codydaig/hubot,leohmoraes/hubot,rlugojr/hubot,SIOPCO/hubot,cameronmcefee/hubot,scboucher/hubot,GrimDerp/hubot,iDTLabssl/hubot,brodul/hubot,CobyR/hubot,mutewinter/hubot,gregkare/hubot,nandub/hubot,dopeboy/hubot,AlexandrPuryshev/hubot,aslihandincer/hubot,scboucher/hubot,alexchenfeng/hubot,WaleedAshraf/hubot,mrb/hubot,jasonkarns/hubot,alex-zhang/hubot,bgranberry/hubot,lisb/hubot,cycomachead/hubot,melexis/melexis-hubot,craig5/hubot,ajschex/hubot,taojuntjpp/hubot,skcript/skubot,rmdelo/appboy-hubot,b3nj4m/hubot,Hartmarken/hubot,joshsobota/hubot,jasonrhodes/botzero,zvelo/hubot,decaffeinate-examples/hubot,blackwellops/hubot,nakaearth/myhubot,davidkassa/hubot,Arthraim/merlin,PopExpert/hubot,fgbreel/hubot,armilam/lessonly-bort,RiddickSky/hubot,mcanthony/hubot,rafaell-lycan/Hubot-X9,rayatbuzzfeed/hubot,plated/hubot,ClaudeBot/hubot,eshamow/gutterbot,lukw00/hubot,voltsdigital/hubot,daudich/hubot,RavenB/hubot