code: public Note reopen(long id, String reason)
  	{
  		SingleElementHandler<Note> noteHandler = new SingleElementHandler<>();
  		makeSingleNoteRequest(id, "reopen", reason, new NotesParser(noteHandler));
  		return noteHandler.get();
  	}
docs: Reopen the given note with the given reason. The reason is optional.
  
  @throws OsmConflictException if the note has already been reopened.
  @throws OsmAuthorizationException if this application is not authorized to write notes
  (Permission.WRITE_NOTES)
  @throws OsmNotFoundException if the note with the given id does not exist (anymore)
  
  @return the updated reopened note