Close #4: using zero copy to parse strings. Less fragmentation and memory usaage

Author: gerasdf

src/UniversalTelegramBot.cpp

@@ -332,7 +332,7 @@ bool UniversalTelegramBot::getMe() {
   String command = "bot" + _token + "/getMe";
   String response = sendGetToTelegram(command); // receive reply from telegram.org
   DynamicJsonDocument doc(maxMessageLength);
-  DeserializationError error = deserializeJson(doc, response);
+  DeserializationError error = deserializeJson(doc, ZERO_COPY(response));
   closeClient();
 
   if (!error) {
@@ -822,7 +822,7 @@ bool UniversalTelegramBot::getFile(String *file_path, long *file_size, String fi
   String command = "bot" + _token + "/getFile?file_id=" + file_id;
   String response = sendGetToTelegram(command); // receive reply from telegram.org
   DynamicJsonDocument doc(maxMessageLength);
-  DeserializationError error = deserializeJson(doc, response);
+  DeserializationError error = deserializeJson(doc, ZERO_COPY(response));
   JsonObject obj = doc.as<JsonObject>(); //there is nothing better right now to use obj.containsKey("result")
   closeClient();