Remove obsolete Group tag

References: https://fedoraproject.org/wiki/Changes/Remove_Group_Tag

djvulibre.spec

@@ -5,7 +5,6 @@ Name: djvulibre
 Version: 3.5.27
 Release: 10%{?dist}
 License: GPLv2+
-Group: Applications/Publishing
 URL: http://djvu.sourceforge.net/
 Source0: http://downloads.sourceforge.net/djvu/%{name}-%{version}.tar.gz
 Patch0: djvulibre-3.5.22-cdefs.patch
@@ -44,7 +43,6 @@ separate sub-package.
 
 %package libs
 Summary: Library files for DjVuLibre
-Group: System Environment/Libraries
 
 %description libs
 Library files for DjVuLibre.
@@ -52,7 +50,6 @@ Library files for DjVuLibre.
 
 %package devel
 Summary: Development files for DjVuLibre
-Group: Development/Libraries
 Requires: %{name}-libs = %{version}-%{release}
 Requires: pkgconfig