Pass EventDispatcher to custom Logger

Dispatcher is required for `fireLogEvent` method to allow for listening to log events.

Author: threesquared

src/RavenServiceProvider.php

@@ -64,6 +64,6 @@ public function register()
             return new Client(config('raven'), $app['queue'], $app->environment());
         });
 
-        $this->app->instance('log', new Log($this->app['log']->getMonolog()));
+        $this->app->instance('log', new Log($this->app['log']->getMonolog(), $this->app['log']->getEventDispatcher()));
     }
 }