String handling causes - 'Reallocating large String' warnings

[neutralvibes]

• framework-arduinoespressif8266 @ 3.30102.0 (3.1.2)

Warnings for reallocating strings, caused by repeated concatenation which can lead to fragmentation are now flagged.

The WebResponses.cpp file does it here

String AsyncWebServerResponse::_assembleHead(uint8_t version){
  if(version){
    addHeader("Accept-Ranges","none");
    if(_chunked)
      addHeader("Transfer-Encoding","chunked");
  }
  String out = String();

It then goes on to append various things to String variable out.

To remedy this, adding out.reserve(200); just after the variable definition seems to handle it.

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