Add link to screencast in README
Add link to screencast in README

rkmallik/uptime-openshift,blendlabs/uptime,nerevu/uptime,GuptaVineet-IBM/upTime_ford,memezilla/uptime,b-pedzik/uptime,cloudfoundry-community/uptime-cfready,f33rx/docker-uptime,MichaelStephan/uptime,SaravananPerumal23/uptime2,f33rx/docker-uptime,nacyot/uptime,blackboard/uptime,arthurpro/uptime,traskat/uptime,WillGuan105/uptime,scalp42/uptime,ifavo/uptime,SpringerPE/uptime,RafeHatfield/nodeuptime,rkmallik/uptime-openshift,askcs/uptime,aregpetrosyan/web,erpframework/uptime,brianjking/uptime,Maluuba/uptime,ptisp/uptime,heamon7/uptime,prune998/uptime,nerevu/uptime,fzaninotto/uptime,SaravananPerumal23/uptime2,0x8BADFOOD/uptime,ptisp/uptime,sinkingshriek/uptime,aregpetrosyan/web,SufianHassan/uptime,phanan/uptime,gleicon/uptime,jraigneau/watchdog,bathree/uptime