[gnome-shell-extensions] Fix Spanish translation header

[Piotr Drąg <piotrdrag src gnome org>]

commit 55ba3c086a469f2b4f889e48fc0cd79b9e99ae6d
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Feb 24 00:20:16 2018 +0100

    Fix Spanish translation header

 po/es.po | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/po/es.po b/po/es.po
index 10ddb5a..a3c0703 100644
--- a/po/es.po
+++ b/po/es.po
@@ -4,7 +4,7 @@
 # Jorge González <jorgegonz svn gnome org>, 2011.
 # Nicolás Satragno <nsatragno gmail com>, 2011.
 # 
-# Daniel Mustieles <daniel mustieles gmail com>, 2011, 2012., 2013, 2014, 2015, 2017.
+# Daniel Mustieles <daniel mustieles gmail com>, 2011-2015, 2017.
 #
 msgid ""
 msgstr ""