[gimp] desktop: use HTTPS everywhere.

[Jehan Pagès <jehanp src gnome org>]

commit b9c2c9ac5916227a6cbfa0d49df09bbf758575ad
Author: Jehan <jehan girinstud io>
Date:   Wed Dec 27 03:35:38 2017 +0100

    desktop: use HTTPS everywhere.
    
    We now use HTTPS everywhere on the website. The link would be anyway
    redirected, but we may as well write down the good link directly.

 desktop/gimp.appdata.xml.in |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/desktop/gimp.appdata.xml.in b/desktop/gimp.appdata.xml.in
index 953470a..bfd18fb 100644
--- a/desktop/gimp.appdata.xml.in
+++ b/desktop/gimp.appdata.xml.in
@@ -36,9 +36,9 @@
     </_p>
   </description>
   <url type="bugtracker">https://bugzilla.gnome.org/page.cgi?id=browse.html&amp;product=GIMP</url>
-  <url type="donation">http://www.gimp.org/donating/</url>
-  <url type="help">http://www.gimp.org/docs/</url>
-  <url type="homepage">http://www.gimp.org/</url>
+  <url type="donation">https://www.gimp.org/donating/</url>
+  <url type="help">https://www.gimp.org/docs/</url>
+  <url type="homepage">https://www.gimp.org/</url>
   <screenshots>
     <screenshot type="default">
       <image>https://www.gimp.org/screenshots/Screenshot-gimp-2.10-painting.jpg</image>