Parameters were incorrect, or wrong order (depending on which overloa…

…d) (#95)

There are only 2 overloads on the extension method:
SendToConversationAsync(this IConversations operations, Activity activity, CancellationToken cancellationToken = default(CancellationToken));
SendToConversationAsync(this IConversations operations, string conversationId, Activity activity, CancellationToken cancellationToken = default(CancellationToken));

msteams-platform/scenarios/bots-personal-conversations.md

@@ -77,7 +77,7 @@ Activity newActivity = new Activity()
 };
 
 // Post the message to chat conversation with user
-await client.Conversations.SendToConversationAsync(newActivity, response.Id);
+await client.Conversations.SendToConversationAsync(newActivity);
 ```
 
 #### Node.js example