update react, material

Change-Id: I4ae3cdf25982f0935641bf5846447e9d223563b4
diff --git a/app.js b/app.js
index 9bff634..da9e365 100644
--- a/app.js
+++ b/app.js
@@ -1,7 +1,7 @@
 'use strict'
 
 import dotenv from 'dotenv'
-dotenv.config()
+const env = dotenv.config()
 
 import { promises as fs } from 'fs'
 import http from 'http'