Call to protected method xxx()

```php
class Foo
{
    protected function bar()
    {
        echo 'bar';
    }
}

$mock = \Mockery::mock(Foo::class);
$mock
    ->shouldAllowMockingProtectedMethods()
    ->makePartial();

$mock->bar();
```

> Call to protected method bar()

phpstan/phpstan v0.12.25
phpstan/phpstan-mockery v0.12.5