Update README.md with specific version
Update README.md with specific version

This is because I pushed a 3.0.0-beta1 to npm which is installed when you `npm install hubot`.
howprice/hubot,decaffeinate-examples/hubot,kgrz/hubot,eetuuuu/hubot,scboucher/hubot,poppingtonic/hubot,lisb/hubot,armilam/lessonly-bort,daudich/hubot,GrimDerp/hubot,rayatbuzzfeed/hubot,yujiroarai/hws-hubot,ajayanandgit/hubot,melexis/melexis-hubot,PopExpert/hubot,awbauer/hubot,Hartmarken/hubot,plated/hubot,wieden-kennedy/hubot,cameronmcefee/hubot,aslihandincer/hubot,CobyR/hubot,mauricionr/hubot,alucardzhou/hubot,lisb/hubot,decaffeinate-examples/hubot,codydaig/hubot,jschell/hubot,alexchenfeng/hubot,julianromera/hubot,nandub/hubot,ajschex/hubot,hubotio/hubot,ykusumi/test-hubot,markstory/hubot,fgbreel/hubot,skcript/skubot,ToriTomyuTomyu/nothing-yet,SIOPCO/hubot,davidkassa/hubot,ClaudeBot/hubot,b3nj4m/hubot,minted/hubot,pchaigno/hubot,jianchen2580/hubot,alexchenfeng/hubot,sdimkov/hubot,AlexandrPuryshev/hubot,mrb/hubot,doudoupower/hubot,taojuntjpp/hubot,lisb/hubot,michaelansel/hubot,ToriTomyuTomyu/nothing-yet,PopExpert/hubot,jasonrhodes/botzero,tiagochiavericosta/hubot,limianwang/hubot,andrewpong/awp-hubot,blackwellops/hubot,RavenB/hubot,cycomachead/hubot,Arthraim/merlin,mutewinter/hubot,eshamow/gutterbot,rafaell-lycan/Hubot-X9,PropertyUX/nubot,jasonkarns/hubot,bradparks/hubot__github_chat_bot,fstehle/hubot,mcanthony/hubot,ooohiroyukiooo/hubot,shinvdu/hubot,nakaearth/myhubot,hcxiong/hubot,markstory/hubot,rlugojr/hubot,kristenmills/hubot,keyvanakbary/hubot,mjurczyk/hubot,WaleedAshraf/hubot,github/hubot,danielcompton/hubot,alexchenfeng/hubot,craig5/hubot,leohmoraes/hubot,joshsobota/hubot,hotrannam/hubot,sharabash/hubot,lukw00/hubot,Drooids/hubot,chadfurman/hubot,kkirsche/hubot,makii42/hubot,Mattlk13/Hubot,hubotio/hubot,alexchenfeng/hubot,github/hubot,wyncode/hubot,nandub/hubot,RiddickSky/hubot,brodul/hubot,scboucher/hubot,ykelvis/hubot,ddmng/brazil82-hubot,ouadie-lahdioui/hubot,gregkare/hubot,iDTLabssl/hubot,dopeboy/hubot,krahman/hubot,geoffreyanderson/hubot,bgranberry/hubot,mchill/hubot,mujiansu/hubot,Snorlock/hubot,alexchenfeng/hubot,edorsey/hubot,zvelo/hubot,rileytg/chenbot,PropertyUX/nubot,vkhang55/hubot,andrewpong/awp-hubot,rileytg/chenbot,voltsdigital/hubot,rmdelo/appboy-hubot,alex-zhang/hubot,msound/hubot