* The boost was obtained by the creation of a Telegram Premium giveaway. This boosts the chat 4 times for the duration of the corresponding Telegram Premium subscription.
* @method string getSource() Source of the boost, always “giveaway”
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* @method int getGiveawayMessageId() Identifier of a message in the chat with the giveaway; the message could have been deleted already. May be 0 if the message isn't sent yet.
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* @method User getUser() Optional. User that won the prize in the giveaway if any
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* @method bool getIsUnclaimed() Optional. True, if the giveaway was completed, but there was no user to win the prize
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*/
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class ChatBoostSourceGiveaway extends Entity implements ChatBoostSource