Fixed wrong loop name

Author: WyriHaximus

src/Factory.php

@@ -28,7 +28,7 @@ public static function create()
             // only use ext-uv on PHP 7
             return new LibUvLoop();
         } elseif (class_exists('libev\EventLoop', false)) {
-            return new LibEvLoop;
+            return new ExtLibevLoop;
         } elseif (class_exists('EventBase', false)) {
             return new ExtEventLoop();
         } elseif (function_exists('event_base_new') && PHP_MAJOR_VERSION === 5) {