[ruby] Add small TODO.

[Vít Ondruch]

commit 4574488d84f91f9da95cb752c07cdb8a93056dc9
Author: Vít Ondruch <vondruch at redhat.com>
Date:   Thu Dec 20 15:32:50 2012 +0100

    Add small TODO.

 ruby.spec |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/ruby.spec b/ruby.spec
index cc87289..546a6f0 100644
--- a/ruby.spec
+++ b/ruby.spec
@@ -88,6 +88,7 @@ License: (Ruby or BSD) and Public Domain
 URL: http://ruby-lang.org/
 Source0: ftp://ftp.ruby-lang.org/pub/%{name}/%{major_minor_version}/%{ruby_archive}.tar.gz
 Source1: operating_system.rb
+# TODO: Try to push SystemTap support upstream.
 Source2: libruby.stp
 
 # http://redmine.ruby-lang.org/issues/5231