Log Message:
Update milter-manager to 2.0.4.

== [release-2-0-4] 2.0.4: 2014-06-20

A bug fix release of 2.0.3

=== Ruby milter

==== Improvements

  * Add Milter::Client::Test::MilterRunner
  * Add Milter::Client::EnvelopeAddress

==== Fixes

  * Fix the bug that milter written in Ruby cannot finish properly on multiple
    CPU environment