message: elle.fstream: Close/reopen the stream when renaming under windows.
  Otherwise, rename fails when running on native windows.
diff: @@ -41,8 +41,14 @@ namespace elle
  {
  if (path != this->path())
  {
  +#ifdef ELLE_WINDOWS
  + this->close();
  +#endif
  fs::rename(this->path(), path);
  this->_path = std::move(path);
  +#ifdef ELLE_WINDOWS
  + this->open(this->_path, std::ios::app | std::ios::out);
  +#endif
  }
  }
  