Apply fixes from StyleCI (#264)

Author: musonza

src/Http/routes.php

@@ -7,7 +7,7 @@
     'middleware' => $middleware,
     'namespace'  => 'Musonza\Chat\Http\Controllers',
     'prefix'     => $chatRoutesPrefix,
-], function () use ($chatRoutesPrefix) {
+], function () {
     /* Conversation */
     Route::get('/conversations', 'ConversationController@index')->name('conversations.index');
     Route::post('/conversations', 'ConversationController@store')->name('conversations.store');