[release-notes] Updated tag 19-0.6.b

[Pete Travis]

The tag '19-0.6.b' was replaced with a new tag. It previously
pointed to:

 8d6483d... Checked out content from master into f19 branch

NOTE: People pulling from the repository will not get the new tag.
For more information, please see:

 http://live.gnome.org/Git/Help/TagUpdates

New tag information:

Tagger: Pete Travis <immanetize at fedoraproject.org>
Date: Mon May 13 18:31:20 2013 -0600

    tagging beta RNs

Changes since the last tag '19-0.5.a':

Pete Travis (1):
      Checked out content from master into f19 branch