Deadlock if BeginTx called with unexpected options

[numberZero]

Describe the bug
If BeginTx (or BeginTxFunc) is called with unexpected options, ExpectationsWereMet deadlocks if called afterwards.

To Reproduce
In the example use db.BeginTx(context.Background(), pgx.TxOptions{IsoLevel: pgx.Serializable}) instead of db.Begin (requires adding BeginTx(context.Context, pgx.TxOptions) (pgx.Tx, error) to the PgxIface). Run tests.

Expected behavior
Error return from ExpectationsWereMet

Additional context
The problem seems to be here:

pgxmock/pgxmock.go

Lines 513 to 517 in ed5a923

	if expected.opts != txOptions {
	return nil, fmt.Errorf("Begin: call with transaction options '%v' was not expected, expected name is '%v'", txOptions, expected.opts)
	}
	expected.triggered = true
	expected.Unlock()

Here expected.Unlock() is not called if expected.opts != txOptions.

[pashagolub]

Thanks for your report. Would you please test #61