Added timeout to WiFi manager.

src/main.cpp

@@ -40,8 +40,8 @@ void saveConfigCallback () {
 void setupWifiConnection() {
   WiFiManager wifiManager;
 
-  //set config save notify callback
   wifiManager.setSaveConfigCallback(saveConfigCallback);
+  wifiManager.setConfigPortalTimeout(300);
   
   //set static ip
   IPAddress _ip,_gw,_sn;