Remove obsolete Group tag

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

rubygem-hocon.spec

@@ -11,7 +11,6 @@ Name: rubygem-%{gem_name}
 Version: 1.2.5
 Release: 3%{?dist}
 Summary: HOCON Config Library
-Group: Development/Languages
 License: ASL 2.0
 URL: https://github.com/puppetlabs/ruby-hocon
 Source0: https://rubygems.org/gems/%{gem_name}-%{version}.gem
@@ -31,7 +30,6 @@ https://github.com/typesafehub/config
 
 %package doc
 Summary: Documentation for %{name}
-Group: Documentation
 Requires: %{name} = %{version}-%{release}
 BuildArch: noarch