Use Illuminate\Events\Dispatcher instead of contract

Laravel dispatcher should be either Illuminate\Contracts\Events\Dispatcher
or Illuminate\Events\Dispatcher, however only the latter has fire()
method, which in turn just a wrapper for dispatch()

Using fire() inplace with contract tests are failing with exceptions:
1. Tmdb\Laravel\Adapters\Tests\EventDispatcherTestLaravel5::it_dispatches_events_through_both_laravel_and_symfony
   Prophecy\Exception\Doubler\MethodNotFoundException: Method `Double\Dispatcher\P25::fire()` is not defined.

2. Tmdb\Laravel\Adapters\Tests\EventDispatcherTestLaravel5::it_returns_the_event_returned_by_the_symfony_dispatcher
   Prophecy\Exception\Doubler\MethodNotFoundException: Method `Double\Dispatcher\P27::fire()` not found.

Author: yukoff

tests/Adapters/EventDispatcherTestLaravel5.php

@@ -12,7 +12,7 @@ class EventDispatcherTestLaravel5 extends AbstractEventDispatcherTest
 {
     protected function createEventDispatcher()
     {
-        $this->laravel = $this->prophesize('Illuminate\Contracts\Events\Dispatcher');
+        $this->laravel = $this->prophesize('Illuminate\Events\Dispatcher');
         $this->symfony = $this->prophesize('Symfony\Component\EventDispatcher\EventDispatcher');
 
         return new AdapterDispatcher(