Fixed a build issue

pushover.el

@@ -60,5 +60,6 @@ EXPIRE is number of seconds before an emergency priority message expires."
     (url-retrieve "https://api.pushover.net/1/messages.json" (lambda (status) (kill-buffer (current-buffer)) t))))
 
 (provide 'pushover)
+(provide 'pushover.el)
 
 ;;; pushover.el ends here