added image/webp to allowed content-types

app/Http/Controllers/ProxyController.php

@@ -260,6 +260,8 @@ class ProxyController extends Controller
                 case 'image/png':
                 case 'image/jpeg':
                 case 'image/gif':
+                case 'image/webp':
+                case 'image/vnd.microsoft.icon':
                 case 'application/font-woff':
                 case 'application/x-font-woff':
                 case 'application/x-empty':
@@ -269,7 +271,6 @@ class ProxyController extends Controller
                 case 'text/plain':
                 case 'image/x-icon':
                 case 'font/eot':
-                case 'image/vnd.microsoft.icon':
                 case 'application/vnd.ms-fontobject':
                 case 'application/x-font-ttf':
                 case 'application/x-www-form-urlencoded':