Remove obsolete Group tag

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

rubygem-http_parser.rb.spec

@@ -5,7 +5,6 @@ Name:		rubygem-%{gem_name}
 Version:	0.6.0
 Release:	14%{?dist}
 Summary:	Simple callback-based HTTP request/response parser
-Group:		Development/Languages
 License:	MIT
 URL:		https://github.com/tmm1/http_parser.rb
 Source0:	https://rubygems.org/gems/%{gem_name}-%{version}.gem
@@ -28,7 +27,6 @@ http://github.com/a2800276/http-parser.java.
 
 %package doc
 Summary:	Documentation for %{name}
-Group:		Documentation
 Requires:	%{name} = %{version}-%{release}
 BuildArch:	noarch