New ESP8266 Arduino core ver. 2.6.0

@mikekgr @PeteKnight
compiled error for me
IPAddress remoteIP() const override;

IPAddress is not supported by 2.6.0, only works with 2.5.0

//*************** Static IP list *********************//
IPAddress dns_ip     (  8,   8,   8,   8);
IPAddress gateway_ip ( 192,  168,   0,   254);
IPAddress subnet_mask(255, 255, 255,   0);
IPAddress ipMCU60 (192, 168, 0, 60);
IPAddress ipMCU56 (192, 168, 0, 56);
IPAddress ipMCU55 (192, 168, 0, 55);
IPAddress Server1 (192, 168, 0, 1);
IPAddress Server2 (192, 168, 0, 100);

//********************************* Setup ***************************************//
void setup()
{
  Serial.begin(115200);
  WiFi.config(ipMCU, gateway_ip, subnet_mask);
  Blynk.connectWiFi (ssid, pass); // connect to wifi network
  Blynk.config(auth, server_ip, port);
  Blynk.connect();