Update .env.example

Author: ivanvermeyen

.env.example

@@ -12,6 +12,10 @@ STAGEFRONT_DATABASE_TABLE=users
 STAGEFRONT_DATABASE_LOGIN_FIELD=email
 STAGEFRONT_DATABASE_PASSWORD_FIELD=password
 
+STAGEFRONT_IP_WHITELIST=null
+STAGEFRONT_IP_WHITELIST_ONLY=false
+STAGEFRONT_IP_WHITELIST_REQUIRE_LOGIN=false
+
 STAGEFRONT_THROTTLE=true
 STAGEFRONT_THROTTLE_TRIES=3
 STAGEFRONT_THROTTLE_DELAY=5