docs: def remove_attr(self, attr_name):
  		""" Remove cookie attribute. Cookie attribute couldn't be removed if cookie is in read-only mode
  		(RuntimeError exception is raised).
  
  		:param attr_name: name of attribute to remove
  		:return: None
  		"""
  		if self.__ro_flag:
  			raise RuntimeError('Read-only cookie changing attempt')
  		name = self.__attr_name(attr_name)
  		if name in self.__attrs.keys():
  			self.__attrs.pop(attr_name)