Remove obsolete Group tag

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

pangomm.spec

@@ -11,7 +11,6 @@ Version:        2.40.2
 Release:        1%{?dist}
 Summary:        C++ interface for Pango
 
-Group:          System Environment/Libraries
 License:        LGPLv2+
 URL:            http://www.gtkmm.org/
 Source0:        http://ftp.gnome.org/pub/GNOME/sources/pangomm/%{release_version}/%{name}-%{version}.tar.xz
@@ -35,7 +34,6 @@ quickly create complex user interfaces.
 
 %package devel
 Summary:        Headers for developing programs that will use %{name}
-Group:          Development/Libraries
 Requires:       %{name}%{?_isa} = %{version}-%{release}
 
 %description devel
@@ -45,7 +43,6 @@ developing pangomm applications.
 
 %package          doc
 Summary:          Developer's documentation for the pangomm library
-Group:            Documentation
 BuildArch:        noarch
 Requires:         %{name} = %{version}-%{release}
 Requires:         libsigc++20-doc