[gnome-epub-thumbnailer] Comment invalid <category> in DOAP file to pass git pre-receive hook

[Andre Klapper <aklapper src gnome org>]

commit 230e0e19ebbbafbb3b41c01b591964fdde21281d
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Dec 16 00:12:40 2018 +0100

    Comment invalid <category> in DOAP file to pass git pre-receive hook

 gnome-epub-thumbnailer.doap | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gnome-epub-thumbnailer.doap b/gnome-epub-thumbnailer.doap
index 6e5dd45..b4b75dc 100644
--- a/gnome-epub-thumbnailer.doap
+++ b/gnome-epub-thumbnailer.doap
@@ -6,7 +6,7 @@
        <name xml:lang="en">gnome-epub-thumbnailer</name>
        <shortdesc xml:lang="en">Thumbnailer for EPub and MOBI books</shortdesc>
        <bug-database rdf:resource="https://gitlab.gnome.org/GNOME/gnome-epub-thumbnailer/issues/"; />
-       <category rdf:resource="http://api.gnome.org/doap-extensions#desktop"; />
+       <!-- <category rdf:resource="http://api.gnome.org/doap-extensions#desktop"; /> -->
        <maintainer>
                <foaf:Person>
                        <foaf:name>Bastien Nocera</foaf:name>