Remove obsolete Group tag

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

PEGTL.spec

@@ -4,7 +4,6 @@ Name:           PEGTL
 Version:        2.4.0
 Release:        2%{?dist}
 Summary:        Parsing Expression Grammar Template Library
-Group:          Development/Libraries
 License:        MIT
 URL:            https://github.com/ColinH/%{name}/
 Source0:        https://github.com/ColinH/%{name}/archive/%{version}.tar.gz
@@ -19,7 +18,6 @@ Expression Grammar (PEG).
 
 %package devel
 Summary:        Development files for %{name}
-Group:          Development/Libraries
 Provides:       %{name}-static = %{version}-%{release}
 Provides:       %{name} = %{version}-%{release}
 Requires:       libstdc++-devel