Update example code.
Update example code.

Example code used old api for
OnBlockConnected and OnBlockDisconnected

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