message: Readme: fill DNS server if setSTAStaticIPConfig
diff: @@ -292,6 +292,8 @@ wifiManager.setSTAStaticIPConfig(IPAddress(192,168,0,99), IPAddress(192,168,0,1)
  ```
  There are a couple of examples in the examples folder that show you how to set a static IP and even how to configure it through the web configuration portal.
  +NOTE: You should fill DNS server if you have HTTP requests with hostnames or syncronize time (NTP). It's the same as gateway ip or a popular (Google DNS: 8.8.8.8).
  +
  #### Custom HTML, CSS, Javascript
  There are various ways in which you can inject custom HTML, CSS or Javascript into the configuration portal.
  The options are:
  