Update release notes with security issues.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 20db9591b241281b0bcc5871418befffca4095a6
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-05-13T21:26:59Z
Releases: 9.0.0
Update release notes with security issues.

Security: CVE-2010-1169, CVE-2010-1170

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