Network: Fixed typo in OP_RETURN msg and also added 'version' error.
Network: Fixed typo in OP_RETURN msg and also added 'version' error.

OP_RETURN error message string was bad. Fixed.

'version' error added: "The transaction was rejected because it uses a non-standard version."

fyookball/electrum,fyookball/electrum,fyookball/electrum