Update README.md on compiling from GitHub (#2543)
Update README.md on compiling from GitHub (#2543)


ii/coredns,coredns/coredns,miekg/coredns,chrisohaver/coredns,johnbelamaric/coredns,yongtang/coredns,johnbelamaric/coredns,miekg/coredns,ii/coredns