Fix inability to send messages to channels

I completly forgot to look at channels when I changed the way to send
messages to other chats, and they were broken. This commit brings
compatibility again. Sorry :(

Fixes: GH-69

Author: Pietro Albini

botogram/bot.py

@@ -278,5 +278,5 @@ def channel(name, api_key):
     """Get a representation of a channel"""
     conn = api.TelegramAPI(api_key)
 
-    obj = objects.Chat({"id": 0, "type": "channel", "username": name}, conn)
+    obj = conn.call("getChat", {"chat_id": name}, expect=objects.Chat)
     return obj

botogram/objects/mixins.py

@@ -45,14 +45,7 @@ def _get_call_args(self, reply_to, extra, notify=True):
         if hasattr(reply_to, "message_id"):
             reply_to = reply_to.message_id
 
-        # Get the correct chat_id
-        # There is an hasattr because User objects doesn't have any type
-        if hasattr(self, "type"):
-            chat_id = self.username if self.type == "channel" else self.id
-        else:
-            chat_id = self.id
-
-        args = {"chat_id": chat_id}
+        args = {"chat_id": self.id}
         if reply_to is not None:
             args["reply_to_message_id"] = reply_to
         if extra is not None:

docs/changelog/0.3.rst

@@ -7,6 +7,17 @@ Changelog of botogram 0.3.x
 
 Here you can find all the changes in the botogram 0.3.x releases.
 
+.. _changelog-0.3.2:
+
+botogram 0.3.2
+==============
+
+*Bugfix release, not yet released.*
+
+* Fix inability to send messages to channels (`issue 69`_)
+
+.. _issue 69: https://github.com/pietroalbini/botogram/issues/69
+
 .. _changelog-0.3.1:
 
 botogram 0.3.1