Remove obsolete Group tag

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

libtiger.spec

@@ -3,7 +3,6 @@ Version:        0.3.4
 Release:        16%{?dist}
 Summary:        Rendering library for Kate streams using Pango and Cairo
 
-Group:          System Environment/Libraries
 License:        LGPLv2+
 URL:            http://libtiger.googlecode.com
 Source0:        http://libtiger.googlecode.com/files/libtiger-%{version}.tar.gz
@@ -25,7 +24,6 @@ http://wiki.xiph.org/index.php/OggKate
 
 %package        devel
 Summary:        Development files for %{name}
-Group:          Development/Libraries
 Requires:       %{name} = %{version}-%{release}
 Requires:       pango-devel
 Requires:       libkate-devel >= 0.2.7
@@ -37,7 +35,6 @@ developing applications that use %{name}.
 
 %package        doc
 Summary:        Documentation for %{name}
-Group:          Documentation
 BuildArch:      noarch
 
 %description    doc