Fixes for examples

examples/src/Entities/ScopeEntity.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace OAuth2ServerExamples\Entities;
+
+use League\OAuth2\Server\Entities\Interfaces\ScopeEntityInterface;
+use League\OAuth2\Server\Entities\Traits\EntityTrait;
+
+class ScopeEntity implements ScopeEntityInterface
+{
+    use EntityTrait;
+
+    function jsonSerialize()
+    {
+        return $this->getIdentifier();
+    }
+}