code: def forum_topic_update(self, topic_id, title=None, category=None):
          
          params = {
              'forum_topic[title]': title,
              'forum_topic[category_id]': category
              }
          return self._get('forum_topics/{0}.json'.format(topic_id), params,
                           method='PUT', auth=True)
docs: Update a specific topic (Login Requires) (UNTESTED).
  
          Parameters:
              topic_id (int): Where topic_id is the topic id.
              title (str): Topic title.
              category (str): Can be: 0, 1, 2 (General, Tags, Bugs & Features
                              respectively).