update backendURL

src/helpers/index.js

@@ -3,5 +3,5 @@ import { mock } from './mock';
 import { delay } from './delay';
 import { statusNumber, statusOptions } from './orderStatus';
 
-export const backendURL = 'https://diploma-back-django.herokuapp.com/';
+export const backendURL = 'https://diploma-back-django.herokuapp.com';
 export { jwtDecode, mock, delay, statusNumber, statusOptions };