code: def get_setting(name):
      
      dh = getattr(settings, 'DJANGO_HISTORY_SETTINGS', {})
      result = None
      for k in name.split('.'):
          if dh is None:
              continue
          result = dh.get(k, None)
          dh = result
      return result
docs: Looks for settings under DJANGO_HISTORY_SETTINGS, supporting dot notation for nested lookups,
      eg. get_setting('EXCLUDE_CHANGES.fields')