Remove obsolete Group tag

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

rubygem-childprocess.spec

@@ -5,7 +5,6 @@ Summary: A simple and reliable gem for controlling external programs
 Name: rubygem-%{gem_name}
 Version: 0.5.9
 Release: 5%{?dist}
-Group: Development/Languages
 License: MIT
 URL: http://github.com/jarib/childprocess
 Source0: http://rubygems.org/gems/%{gem_name}-%{version}.gem
@@ -21,7 +20,6 @@ programs running in the background on any Ruby / OS combination.
 
 %package doc
 Summary: Documentation for %{name}
-Group: Documentation
 Requires: %{name} = %{version}-%{release}
 BuildArch: noarch