add post update

pydiscourse/client.py

@@ -129,6 +129,11 @@ class DiscourseClient(object):
         """
         return self._post('/posts', raw=content, **kwargs)
 
+    def update_post(self, post_id, content, edit_reason='', **kwargs):
+        kwargs['post[raw]'] = content
+        kwargs['post[edit_reason'] = edit_reason
+        return self._put('/posts/{0}'.format(post_id), **kwargs)
+
     def topics_by(self, username, **kwargs):
         url = '/topics/created-by/{0}.json'.format(username)
         return self._get(url, **kwargs)['topic_list']['topics']