docs: Add chainhash to README.md (#739)
docs: Add chainhash to README.md (#739)


btcsuite/btcd,jrick/btcd,dajohi/btcd,davecgh/btcd,adiabat/btcd,ppcsuite/ppcd,jcmincke/dcrd,ppcsuite/ppcd,adiabat/btcd,davecgh/btcd,cqswxj2013/btcd,dajohi/btcd,stevenroose/btcd,jrick/dcrd,wallclockbuilder/btcd,dajohi/btcd,jongillham/btcd,jrick/btcd,Stash-Crypto/btcd,Stash-Crypto/btcd,Roasbeef/btcd,Roasbeef/btcd,stevenroose/btcd,BitGo/prova,jcmincke/dcrd,aakselrod/btcd,jrick/dcrd,tb00/btcd,ltcsuite/ltcd,jongillham/btcd,jrick/btcd,BitGo/prova,decred/dcrd,jcmincke/dcrd,tb00/btcd,ltcsuite/ltcd,wallclockbuilder/btcd,aakselrod/btcd,btcsuite/btcd,decred/dcrd,cqswxj2013/btcd