Add support for handling poll answer updates

src/TgBotLib/Events/PollAnswerEvent.php

@@ -0,0 +1,30 @@
+<?php
+
+    namespace TgBotLib\Events;
+
+    use TgBotLib\Abstracts\UpdateEvent;
+    use TgBotLib\Bot;
+    use TgBotLib\Enums\UpdateEventType;
+    use TgBotLib\Objects\PollAnswer;
+
+    abstract class PollAnswerEvent extends UpdateEvent
+    {
+        /**
+         * @inheritDoc
+         */
+        public static function getEventType(): UpdateEventType
+        {
+            return UpdateEventType::POLL_ANSWER;
+        }
+
+        /**
+         * A user changed their answer in a non-anonymous poll.
+         * Bots receive new votes only in polls that were sent by the bot itself.
+         *
+         * @return PollAnswer The poll answer associated with the current update.
+         */
+        protected function getPollAnswer(): PollAnswer
+        {
+            return $this->update->getPollAnswer();
+        }
+    }