Remove obsolete Group tag

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

rubygem-mime-types.spec

@@ -6,7 +6,6 @@ Summary: The mime-types library provides a library
 Name: rubygem-%{gem_name}
 Version: 3.1
 Release: 5%{?dist}
-Group: Development/Languages
 License: MIT
 URL: https://github.com/mime-types/ruby-mime-types/
 Source0: https://rubygems.org/gems/%{gem_name}-%{version}.gem
@@ -34,7 +33,6 @@ changes described in the History file.
 
 %package doc
 Summary: Documentation for %{name}
-Group: Documentation
 
 Requires: %{name} = %{version}-%{release}