Remove obsolete Group tag

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

unique.spec

@@ -3,7 +3,6 @@ Version:        1.1.6
 Release:        21%{?dist}
 Summary:        Single instance support for applications
 
-Group:          System Environment/Libraries
 License:        LGPLv2+
 URL:            http://www.gnome.org/~ebassi/source/
 Source0:        http://download.gnome.org/sources/libunique/1.1/libunique-%{version}.tar.bz2
@@ -29,7 +28,6 @@ either exits immediately or sends a command to the running instance.
 
 %package devel
 Summary: Libraries and headers for Unique
-Group: Development/Libraries
 Requires: %{name} = %{version}-%{release}
 Requires: dbus-glib-devel
 Requires: gtk2-devel