False error 'UnusedThrows' when using new SplFileObject

The code
```
	/**
	 * @throws \Exception
	 */
	public function shouldBeCorrect()
	{
		new \SplFileObject(''); // The phpdoc say @throws RuntimeException
	}
```
Is failing with the error message ` Unused @throws Exception annotation`

See https://github.com/pepakriz/phpstan-exception-rules/pull/105