code: def remove_source_by_nick(self, nick):
          
          if not self.cfg.has_section("following"):
              return False
  
          ret_val = self.cfg.remove_option("following", nick)
          self.write_config()
          return ret_val
docs: Removes a :class:`Source` form the config’s following section.
  
          :param str nick: nickname for which will be searched in the config