Add support for CallbackQuery events.

src/TgBotLib/Events/CallbackQueryEvent.php

@@ -0,0 +1,28 @@
+<?php
+
+    namespace TgBotLib\Events;
+
+    use TgBotLib\Abstracts\UpdateEvent;
+    use TgBotLib\Enums\UpdateEventType;
+    use TgBotLib\Objects\CallbackQuery;
+
+    abstract class CallbackQueryEvent extends UpdateEvent
+    {
+        /**
+         * @inheritDoc
+         */
+        public static function getEventType(): UpdateEventType
+        {
+            return UpdateEventType::CALLBACK_QUERY;
+        }
+
+        /**
+         * New incoming callback query
+         *
+         * @return CallbackQuery
+         */
+        protected function getCallbackQuery(): CallbackQuery
+        {
+            return $this->update->getCallbackQuery();
+        }
+    }