Set default maxLedgerVersion to last closed ledger when requesting account_tx
Set default maxLedgerVersion to last closed ledger when requesting account_tx

wilsonianb/ripple-lib,darkdarkdragon/ripple-lib,ripple/ripple-lib,darkdarkdragon/ripple-lib,ripple/ripple-lib,ripple/ripple-lib,darkdarkdragon/ripple-lib,wilsonianb/ripple-lib,wilsonianb/ripple-lib,ripple/ripple-lib