feat: add classroom book type

composer.json

@@ -14,7 +14,7 @@
         }
     ],
     "require": {
-        "php": "^7.3|^8.0",
+        "php": ">=7.3",
         "ext-curl": "*",
         "ext-json" : "*",
         "league/oauth2-client": "~2.3",

src/Entity/Book.php

@@ -15,6 +15,7 @@ abstract class Book extends Entity
     const TYPE_PDF = 'pdf';
     const TYPE_VIDEO = 'video';
     const TYPE_AUDIOTALK = 'audioTalk';
+    const TYPE_CLASSROOM = 'classroom';
 
     const FORMAT_PDF = 'pdf';
     const FORMAT_EPUB = 'epub';

src/Entity/ClassroomBook.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Bookboon\Api\Entity;
+
+class ClassroomBook extends Book
+{
+    const _OWN_TYPE = Book::TYPE_CLASSROOM;
+}