10.15 release notes

[Rick Hillegas]

I have published preliminary release notes for the 10.15.1 release 
(http://svn.apache.org/viewvc/db/derby/code/trunk/RELEASE-NOTES.html?view=co) 
and proposed a schedule for vetting the release. See 
https://wiki.apache.org/db-derby/DerbyTenFifteenOneRelease  Please let 
me know how I can improve these release notes.

Thanks,
-Rick