message: Bug fix for problem discovered when setting length to 1 for additional parameters
  The initialization of the buffer holding the value stopped before the last character and storage did not take into account the extra-byte for end of string.
diff: @@ -34,7 +34,7 @@ void WiFiManagerParameter::init(const char *id, const char *placeholder, const c
  _placeholder = placeholder;
  _length = length;
  _value = new char[length + 1];
  - for (int i = 0; i < length; i++) {
  + for (int i = 0; i < length + 1; i++) {
  _value[i] = 0;
  }
  if (defaultValue != NULL) {
  @@ -597,7 +597,7 @@ void WiFiManager::handleWifiSave() {
  //read parameter
  String value = server->arg(_params[i]->getID()).c_str();
  //store it in array
  - value.toCharArray(_params[i]->_value, _params[i]->_length);
  + value.toCharArray(_params[i]->_value, _params[i]->_length + 1);
  DEBUG_WM(F("Parameter"));
  DEBUG_WM(_params[i]->getID());
  DEBUG_WM(value);
  