readme: be clear that models require FQN (#1012)
readme: be clear that models require FQN (#1012)

I've tested this and yes, it *always* requires a FQN.

Therefore I removed the extra note regarding namespace/wrapping because
even by default Laravel has the `App\` namesapce, which requires this.

Fixes https://github.com/barryvdh/laravel-ide-helper/issues/995
barryvdh/laravel-ide-helper