Fixed missing import

mnapoli · mnapoli · commit bad699122224 · 2015-02-27T15:08:12.000+13:00
diff --git a/lib/Github/Api/Issue/Labels.php b/lib/Github/Api/Issue/Labels.php
@@ -4,6 +4,7 @@
 
 use Github\Api\AbstractApi;
 use Github\Exception\InvalidArgumentException;
+use Github\Exception\MissingArgumentException;
 
 /**
  * @link   http://developer.github.com/v3/issues/labels/
