[gimp-help] Update links to https

[Jordi Mas <jmas src gnome org>]

commit a36ae90793d5a8412a7930bc2235c855e4582dc2
Author: Jordi Mas <jmas softcatala org>
Date:   Thu Sep 17 23:23:30 2020 +0200

    Update links to https

 src/appendix/bibliography.xml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/appendix/bibliography.xml b/src/appendix/bibliography.xml
index 73b68b7e7..00ba3b414 100644
--- a/src/appendix/bibliography.xml
+++ b/src/appendix/bibliography.xml
@@ -29,7 +29,7 @@
       </publisher>
       <isbn>ISBN 1-59059-587-4</isbn>
       <releaseinfo>
-        <ulink url="http://gimpbook.com/";>http://gimpbook.com/</ulink>
+        <ulink url="https://gimpbook.com/";>https://gimpbook.com/</ulink>
       </releaseinfo>
     </biblioentry>
     <biblioentry id="bibliography-books-foley01">
@@ -80,8 +80,8 @@
       <abbrev>AdobeRGB</abbrev>
       <title>Adobe RGB (1998) ICC Profile</title>
       <releaseinfo>
-        <ulink url="http://www.adobe.com/digitalimag/adobergb.html";>
-          http://www.adobe.com/digitalimag/adobergb.html
+        <ulink url="https://www.adobe.com/digitalimag/adobergb.html";>
+          https://www.adobe.com/digitalimag/adobergb.html
         </ulink>
       </releaseinfo>
     </biblioentry>