Allow to pass password when creating a new account

[sdaveas]

NewAccountWithMnemonic function does now accept a password to forward to bip39.NewSeedWithErrorChecking. Please take a look at #36 which adds this option.

go-sui-sdk/account/account.go

Lines 47 to 61 in 5eea4e9

	func NewAccountWithMnemonic(mnemonic string) (*Account, error) {
	seed, err := bip39.NewSeedWithErrorChecking(mnemonic, "")
	if err != nil {
	return nil, err
	}
	key, err := derivation.DeriveForPath("m/44'/784'/0'/0'/0'", seed)
	if err != nil {
	return nil, err
	}
	scheme, err := sui_types.NewSignatureScheme(0)
	if err != nil {
	return nil, err
	}
	return NewAccount(scheme, key.Key), nil
	}