Merge pull request #141 from sQu4rks/issue-140

Update Cards Handling to check correct attribute for instance of AdaptiveCards (solves #140)

Author: sQu4rks

docs/user/cards.rst

@@ -31,7 +31,7 @@ Lets dive into a simple example that sends a card to a room
     card = AdaptiveCard(body=[greeting, first_name, age], actions=[submit])
 
     api = WebexTeamsAPI()
-    api.messages.create(text="fallback", roomId="...", cards=card)
+    api.messages.create(text="fallback", roomId="...", attachments=[card])
 
 The message we send with this code then looks like this in our Webex Teams
 client:

webexteamssdk/api/messages.py

@@ -261,7 +261,7 @@ def create(self, roomId=None, parentId=None, toPersonId=None,
             for item, attachment in enumerate(attachments):
                 check_type(attachment, (dict, AdaptiveCard))
 
-                if isinstance(attachments, AdaptiveCard):
+                if isinstance(attachment, AdaptiveCard):
                     attachments[item] = make_attachment(attachment)
 
         post_data = dict_from_items_with_values(