Remove obsolete Group tag

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

rubygem-test_declarative.spec

@@ -5,7 +5,6 @@ Summary: Simply adds a declarative test method syntax to test/unit
 Name: rubygem-%{gem_name}
 Version: 0.0.5
 Release: 14%{?dist}
-Group: Development/Languages
 License: MIT
 URL: http://github.com/svenfuchs/test_declarative
 Source0: http://rubygems.org/gems/%{gem_name}-%{version}.gem
@@ -23,7 +22,6 @@ Simply adds a declarative test method syntax to test/unit.
 
 %package doc
 Summary: Documentation for %{name}
-Group: Documentation
 Requires: %{name} = %{version}-%{release}
 BuildArch: noarch