filter method of trait and interface have different number of args

[Shelob9]

The trait implements the method filter with a method that has 4 arguments -

• https://github.com/netrivet/wp-event-emitter/blob/master/src/EventEmitterTrait.php#L58

The interface defines the signature of that method to have 3 arguments -

• https://github.com/netrivet/wp-event-emitter/blob/master/src/EventEmitterInterface.php#L34

4 is the correct number. I will make a PR to correct interface.