Remove obsolete Group tag

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

perl-CSS-Minifier.spec

@@ -3,7 +3,6 @@ Version:    0.01
 Release:    27%{?dist}
 # lib/CSS/Minifier.pm -> GPL+ or Artistic
 License:    GPL+ or Artistic 
-Group:      Development/Libraries
 Summary:    Remove unnecessary whitespace from CSS files 
 Source:     https://cpan.metacpan.org/authors/id/P/PM/PMICHAUX/CSS-Minifier-%{version}.tar.gz 
 Url:        https://metacpan.org/release/CSS-Minifier