FEATURE: add functionality for editing custom fields

app/Http/Requests/EditCustomFieldRequest.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Http\Requests;
+
+class EditCustomFieldRequest extends Request
+{
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'name'      => 'required',
+            'minLength' => 'numeric|min:0',
+            'maxLength' => 'numeric|min:0',
+        ];
+    }
+}