Fix another broken link in README
Fix another broken link in README

[ci-skip]
Link to protocol spec
itp4IBM/fabric,ahuachen/fabric,murali-katipalli-dtcc/fabric,popldo/fabric,bren3582/fabric,angrbrd/fabric,ariccy/fabric,isghe/obc-peer,gongsu832/fabric,popldo/fabric,jjjjibm/fabric,murali-katipalli-dtcc/fabric,tuand27613/obc-peer,openblockchain/obc-peer,srderson/fabric,angrbrd/fabric,binhn/obc-peer,jjjjibm/fabric,gromeroar/fabric,ariccy/fabric,JonathanLevi/fabric,jjjjibm/fabric,popldo/fabric,ariccy/fabric,JonathanLevi/fabric,tuand27613/fabric,andresgaragiola/fabric,jjjjibm/fabric,itp4IBM/fabric,isghe/obc-peer,gennadylaventman/fabric,bburgdave/fabric,murali-katipalli-dtcc/fabric,hyperledger-archives/fabric,gromeroar/fabric,srderson/fabric,bburgdave/fabric,ahuachen/fabric,binhn/obc-peer,adecaro/fabric,isghe/obc-peer,hyperledger-archives/fabric,adecaro/fabric,ahuachen/fabric,gennadylaventman/fabric,isghe/obc-peer,srderson/fabric,hyperledger-archives/fabric,openblockchain/obc-peer,ahuachen/fabric,gennadylaventman/fabric,gennadylaventman/fabric,itp4IBM/fabric,bren3582/fabric,murali-katipalli-dtcc/fabric,jjjjibm/fabric,ariccy/fabric,adecaro/fabric,bburgdave/fabric,murali-katipalli-dtcc/fabric,andresgaragiola/fabric,bren3582/fabric,gennadylaventman/fabric,tuand27613/fabric,angrbrd/fabric,gongsu832/fabric,angrbrd/fabric,popldo/fabric,tuand27613/fabric,itp4IBM/fabric,andresgaragiola/fabric,ariccy/fabric,hyperledger-archives/fabric,JonathanLevi/fabric,openblockchain/obc-peer,jjjjibm/fabric,adecaro/fabric,bren3582/fabric,adecaro/fabric,gromeroar/fabric,ahuachen/fabric,bburgdave/fabric,bren3582/fabric,isghe/obc-peer,murali-katipalli-dtcc/fabric,bren3582/fabric,ariccy/fabric,srderson/fabric,tuand27613/fabric,gongsu832/fabric,popldo/fabric,ahuachen/fabric,ariccy/fabric,bburgdave/fabric,angrbrd/fabric,adecaro/fabric,JonathanLevi/fabric,andresgaragiola/fabric,binhn/obc-peer,gromeroar/fabric,jjjjibm/fabric,popldo/fabric,tuand27613/obc-peer,andresgaragiola/fabric,gromeroar/fabric,tuand27613/fabric,bren3582/fabric,popldo/fabric,JonathanLevi/fabric,andresgaragiola/fabric,JonathanLevi/fabric,hyperledger-archives/fabric,angrbrd/fabric,tuand27613/fabric,hyperledger-archives/fabric,srderson/fabric,srderson/fabric,ahuachen/fabric,srderson/fabric,JonathanLevi/fabric,murali-katipalli-dtcc/fabric,gennadylaventman/fabric,tuand27613/fabric,itp4IBM/fabric,hyperledger-archives/fabric,gromeroar/fabric,tuand27613/obc-peer,andresgaragiola/fabric,gromeroar/fabric,itp4IBM/fabric,itp4IBM/fabric,adecaro/fabric,gongsu832/fabric,gennadylaventman/fabric,angrbrd/fabric