Merge pull request #89 from IlCallo/bugfix-transformer-factory-singleton

Transformations now uses a new FractalTransformFactory for every request instead of sharing a singleton

src/ResponderServiceProvider.php

@@ -212,7 +212,7 @@ protected function registerPaginationBindings()
      */
     protected function registerTransformationBindings()
     {
-        $this->app->singleton(TransformFactoryContract::class, function ($app) {
+        $this->app->bind(TransformFactoryContract::class, function ($app) {
             return $app->make(FractalTransformFactory::class);
         });