[gthumb] updated for version 3.7.1

[Paolo Bacchilega <paobac src gnome org>]

commit c2a0c415679b511d5f5436d89edff3445250d63a
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Mon Feb 18 20:46:22 2019 +0100

    updated for version 3.7.1

 NEWS | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/NEWS b/NEWS
index dba2f4c1..bfb938b5 100644
--- a/NEWS
+++ b/NEWS
@@ -20,6 +20,7 @@ version 3.7.1
   * Preferences: fixed crash when setting the current location as default.
   * About dialog: fixed website url.
   * Jpeg loader: try to load broken images.
+  * Contact sheet: error if the theme file could not be loaded. (issue 18)
   * Removed deprecated functions.
 
 version 3.6.1