Adding greyscale implementation

Config/thumbnails.php

@@ -28,8 +28,9 @@ return [
 //        'flip' => [
 //            'mode' => 'h'
 //        ],
-        'gamma' => [
-            'correction' => '1.8'
-        ],
+//        'gamma' => [
+//            'correction' => '1.8'
+//        ],
+          'greyscale' => [],
     ]
 ];

Image/Intervention/Manipulations/Greyscale.php

+<?php namespace Modules\Media\Image\Intervention\Manipulations;
+
+use Modules\Media\Image\ImageHandlerInterface;
+
+class Greyscale implements ImageHandlerInterface
+{
+    /**
+     * Handle the image manipulation request
+     * @param \Intervention\Image\Image $image
+     * @param array $options
+     * @return \Intervention\Image\Image
+     */
+    public function handle($image, $options)
+    {
+        return $image->greyscale();
+    }
+}