Add a comma to the end of an array element, to follow our convention.

Summary:
Was missing a ',' at the end of a one-element array. Whoops.

Test Plan:
It's a freaking comma. :P

Reviewers:
epriestley

CC:

Differential Revision: 541

src/applications/conduit/method/paste/info/ConduitAPI_paste_info_Method.php

@@ -34,7 +34,7 @@ class ConduitAPI_paste_info_Method extends ConduitAPIMethod {
 
   public function defineErrorTypes() {
     return array(
-      'ERR_BAD_PASTE' => 'No such paste exists'
+      'ERR_BAD_PASTE' => 'No such paste exists',
     );
   }