Added Chip ID into HTTP header (#3877)

Author: mkilinskidev

libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.cpp

@@ -263,6 +263,7 @@ HTTPUpdateResult ESP8266HTTPUpdate::handleUpdate(HTTPClient& http, const String&
     http.setTimeout(_httpClientTimeout);
     http.setFollowRedirects(_followRedirects);
     http.setUserAgent(F("ESP8266-http-Update"));
+    http.addHeader(F("x-ESP8266-Chip-ID"), String(ESP.getChipId()));
     http.addHeader(F("x-ESP8266-STA-MAC"), WiFi.macAddress());
     http.addHeader(F("x-ESP8266-AP-MAC"), WiFi.softAPmacAddress());
     http.addHeader(F("x-ESP8266-free-space"), String(ESP.getFreeSketchSpace()));