Fix a couple of typos in README.md.
Fix a couple of typos in README.md.

jrick/dcrd,dajohi/btcd,btcsuite/btcrpcclient,Roasbeef/btcd,wallclockbuilder/btcrpcclient,dajohi/btcd,davecgh/btcd,ppcsuite/ppcd,jrick/btcd,aakselrod/btcrpcclient,aakselrod/btcrpcclient,decred/dcrd,btcsuite/btcd,ppcsuite/ppcd,aakselrod/btcd,davecgh/btcrpcclient,wallclockbuilder/btcd,runeaune/btcrpcclient,runeaune/btcrpcclient,jrick/btcrpcclient,dajohi/btcd,jrick/btcrpcclient,ltcsuite/ltcd,wallclockbuilder/btcrpcclient,btcsuite/btcrpcclient,davecgh/btcd,tb00/btcd,jrick/dcrd,Stash-Crypto/btcd,jrick/btcd,ppcsuite/btcrpcclient,decred/dcrd,FactomProject/btcrpcclient,btcsuite/btcd,ppcsuite/btcrpcclient,FactomProject/btcrpcclient,Roasbeef/btcd,ltcsuite/ltcd,jrick/btcd,tb00/btcd,Stash-Crypto/btcd,wallclockbuilder/btcd,aakselrod/btcd