Add release event in autoload.php

Author: AH-dark

src/class/github/autoload.php

@@ -13,4 +13,7 @@
 require_once __DIR__ . "/pullrequest.class.php";
 
 // Issue Event
-require_once __DIR__ . "/issues.class.php";
+require_once __DIR__ . "/issues.class.php";
+
+// Release Event
+require_once __DIR__ . "/release.class.php";