README: moved citation to top
README: moved citation to top

vcflib/vcflib,vcflib/vcflib,ekg/vcflib,vcflib/vcflib,ekg/vcflib,ekg/vcflib,vcflib/vcflib,vcflib/vcflib,ekg/vcflib,ekg/vcflib,vcflib/vcflib,vcflib/vcflib,vcflib/vcflib