fixed class file headers

Author: mxschmitt

src/API.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Class API | src/API.class.php
+ * Class API | src/API.php
  *
  * Main class which will be used to connect to the SinusBot
  *

src/Instance.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Class Instance | src/Instance.class.php
+ * Class Instance | src/Instance.php
  *
  * A single Instance with his available actions
  *

src/Playlist.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Class Playlist | src/Playlist.class.php
+ * Class Playlist | src/Playlist.php
  *
  * A single Playlist with his available actions
  *

src/RestClient.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Class RestClient | src/RestClient.class.php
+ * Class RestClient | src/RestClient.php
  *
  * RestClient is used to perform the http requests
  *