New Postgres committer: Kevin Grittner

I am pleased to announce that Kevin Grittner has accepted the core
committee's invitation to become our newest committer.  As you all
know, Kevin's done a good deal of work on the project over the past
couple of years.  We judged that he has the requisite skills,
dedication to the project, and a suitable degree of caution to be
a good committer.  Please join me in welcoming him aboard.
        regards, tom lane