Remove obsolete Group tag

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

perl-Sereal.spec

@@ -11,7 +11,6 @@ Release:        4%{?dist}
 Summary:        Fast, compact, powerful binary (de-)serialization
 # Makefile.PL defines LICENSE
 License:        GPL+ or Artistic
-Group:          Development/Libraries
 URL:            https://metacpan.org/release/Sereal
 Source0:        https://cpan.metacpan.org/authors/id/Y/YV/YVES/Sereal-%{version}.tar.gz
 BuildArch:      noarch