Remove obsolete Group tag

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

rubygem-crack.spec

@@ -4,7 +4,6 @@ Summary: Really simple JSON and XML parsing, ripped from Merb and Rails
 Name: rubygem-%{gem_name}
 Version: 0.4.2
 Release: 8%{?dist}
-Group: Development/Languages
 License: MIT
 URL: http://github.com/jnunemaker/crack
 Source0: http://rubygems.org/gems/%{gem_name}-%{version}.gem
@@ -24,7 +23,6 @@ Really simple JSON and XML parsing, ripped from Merb and Rails.
 
 %package doc
 Summary: Documentation for %{name}
-Group: Documentation
 
 Requires: %{name} = %{epoch}:%{version}-%{release}