Register first projector

[isaac-souza]

In the docs (https://spatie.be/docs/laravel-event-sourcing/v4/using-projectors/writing-your-first-projector), you guys forgot to mention it is necessary to register the first Projector (AccountBalanceProjector).

I'm assuming it is because of this,

Let's not forget to register this projector:

// in a service provider of your own
Projectionist::addProjector(TransactionCountProjector::class);

These lines refer to the second Projector, so I'm assuming it is also necessary to register the first one.