Added a Limitations section in README.
Added a Limitations section in README.

douxiaozhao/disque,chen-tian/disque,tempbottle/disque,douxiaozhao/disque,Koed00/disque,lamby/pkg-disque,ErikDubbelboer/disque,CodyReichert/disque,jmptrader/disque,mopuri-sandeep/disque,GrimDerp/disque,chen-tian/disque,c2j/disque,antirez/disque,seppo0010/disque,hanicker/disque,gideonairex/disque,sunheehnus/disque,ErikDubbelboer/disque,CodyReichert/disque,seppo0010/disque,gideonairex/disque,jmptrader/disque,lamby/disque,jmptrader/disque,felixbuenemann/disque,felixbuenemann/disque,antirez/disque,lamby/disque,GrimDerp/disque,hanicker/disque,sunheehnus/disque,themage/disque,themage/disque,tempbottle/disque,mopuri-sandeep/disque,c2j/disque,Koed00/disque,themage/disque,lamby/pkg-disque