message: Lower RAM usage of library
  Place remaining debug messages into Flash using F().
diff: @@ -92,14 +92,14 @@ bool WiFiManager::addParameter(WiFiManagerParameter *p) {
  if (new_params != NULL) {
  _params = new_params;
  } else {
  - DEBUG_WM("ERROR: failed to realloc params, size not increased!");
  + DEBUG_WM(F("ERROR: failed to realloc params, size not increased!"));
  return false;
  }
  }
  _params[_paramsCount] = p;
  _paramsCount++;
  - DEBUG_WM("Adding parameter");
  + DEBUG_WM(F("Adding parameter"));
  DEBUG_WM(p->getID());
  return true;
  }
  @@ -199,7 +199,7 @@ boolean WiFiManager::startConfigPortal() {
  boolean WiFiManager::startConfigPortal(char const *apName, char const *apPassword) {
  //setup AP
  WiFi.mode(WIFI_AP_STA);
  - DEBUG_WM("SET AP STA");
  + DEBUG_WM(F("SET AP STA"));
  _apName = apName;
  _apPassword = apPassword;
  @@ -273,7 +273,7 @@ int WiFiManager::connectWifi(String ssid, String pass) {
  }
  //fix for auto connect racing issue
  if (WiFi.status() == WL_CONNECTED) {
  - DEBUG_WM("Already connected. Bailing out.");
  + DEBUG_WM(F("Already connected. Bailing out."));
  return WL_CONNECTED;
  }
  //check if we have ssid and pass and force those, if not, try with last saved values
  @@ -281,7 +281,7 @@ int WiFiManager::connectWifi(String ssid, String pass) {
  WiFi.begin(ssid.c_str(), pass.c_str());
  } else {
  if (WiFi.SSID()) {
  - DEBUG_WM("Using last saved values, should be faster");
  + DEBUG_WM(F("Using last saved values, should be faster"));
  //trying to fix connection in progress hanging
  ETS_UART_INTR_DISABLE();
  wifi_station_disconnect();
  @@ -289,7 +289,7 @@ int WiFiManager::connectWifi(String ssid, String pass) {
  WiFi.begin();
  } else {
  - DEBUG_WM("No saved credentials");
  + DEBUG_WM(F("No saved credentials"));
  }
  }
  @@ -329,9 +329,9 @@ uint8_t WiFiManager::waitForConnectResult() {
  }
  void WiFiManager::startWPS() {
  - DEBUG_WM("START WPS");
  + DEBUG_WM(F("START WPS"));
  WiFi.beginWPSConfig();
  - DEBUG_WM("END WPS");
  + DEBUG_WM(F("END WPS"));
  }
  /*
  String WiFiManager::getSSID() {
  @@ -764,7 +764,7 @@ void WiFiManager::setRemoveDuplicateAPs(boolean removeDuplicates) {
  template <typename Generic>
  void WiFiManager::DEBUG_WM(Generic text) {
  if (_debug) {
  - Serial.print("*WM: ");
  + Serial.print(F("*WM: "));
  Serial.println(text);
  }
  }
  