quick spelling correction

[bdougie]

Reading the chat example and noticed a quick typo correction

[davideast]

Just kicking off the CLA bot.

[joshnaNalla]

How to add date to specific message aim using the below method but not able to get for each message

• (instancetype)initWithSenderId:(NSString *)senderId
  senderDisplayName:(NSString *)senderDisplayName
  date:(NSDate *)date
  text:(NSString *)text;