Update the ethash.run arguments in README to match the actual arguments
Update the ethash.run arguments in README to match the actual arguments

ethereumjs/ethereumjs-vm,ethereumjs/ethereumjs-vm,ethereumjs/ethashjs,ethereumjs/ethereumjs-vm,ethereum/ethashjs,ethereum/ethereumjs-vm,ethereumjs/ethereumjs-vm,ethereumjs/ethereumjs-vm