Updated README.md

* Removed outdated contents.
* Added the Bugzilla URL to manage this Ruby module's status.
  https://bugzilla.redhat.com/show_bug.cgi?id=1490275

README.md

@@ -1,16 +1,7 @@
-ruby dependencies
-====================
+# modules/ruby
 
-build dependencies calculated by brt_dep_solver
------------------------------------------------
-autoconf
-checksec
-cmake
-libyaml
-multilib-rpm-config
-systemtap
+## Current status
 
-runtime dependencies calculated by brt_dep_solver
--------------------------------------------------
-ruby
-rubypick
+This module is not available yet.
+See this Bugzilla ticket to check the status.
+https://bugzilla.redhat.com/show_bug.cgi?id=1490275