code: def _remove_debug_only(self):
          
          LOGGER.debug('Removing debug only from handlers')
          for handler in self.config[self.HANDLERS]:
              if self.DEBUG_ONLY in self.config[self.HANDLERS][handler]:
                  del self.config[self.HANDLERS][handler][self.DEBUG_ONLY]
docs: Iterate through each handler removing the invalid dictConfig key of
          debug_only.