Ignore some case for EarlyExit rule

I have the following method
```php
public function foo(Collection $collection)
{
$collection->add($this->bar);
$collection->add($this->bar);

if ($collection instanceof BOOM) {
$collection->add($this->some)
}
}
```
which reports an error because I didn't use an early exit.

But changing
```php
if ($collection instanceof BOOM) {
$collection->add($this->some)
}
```
to
```php
if (! $collection instanceof BOOM) {
return;
}

$collection->add($this->some)
```
is taking more lines and not really reducing complexity.

Also, I may change later to
```php
public function foo(Collection $collection)
{
$collection->add($this->bar);
$collection->add($this->bar);

if ($collection instanceof Boom) {
$collection->add($this->some)
}

if ($collection instanceof Please) {
$collection->add($this->thanks)
}
}
```
and so on.

The slevomat Early Exit standard has some configuration available
https://github.com/slevomat/coding-standard/blob/master/doc/control-structures.md#slevomatcodingstandardcontrolstructuresearlyexit-

I would say it's better to use some.