update unique username

app/Http/Controllers/HumanResourceController.php

@@ -22,7 +22,8 @@ class HumanResourceController extends Controller
             'name'          => 'required',
             'ktp_number'    => 'required|string|unique:m_users,ktp_number',
             'employee_type' => 'required',
-            'company_id'    => 'required'
+            'company_id'    => 'required',
+            'username'      => 'unique:m_users,username'
         ]);
 
         $data = $request->all();