Bugfix: enable API to interact with notes

Otherwise API doesn't allow to interact with notes because of this omission.

Author: 512banque

src/IntercomClient.php

@@ -60,6 +60,7 @@ public function __construct($usernamePart, $passwordPart)
     $this->tags = new IntercomTags($this);
     $this->counts = new IntercomCounts($this);
     $this->bulk = new IntercomBulk($this);
+    $this->notes = new IntercomNotes($this);
 
     $this->usernamePart = $usernamePart;
     $this->passwordPart = $passwordPart;