Should the removal of SnapshotNow be in the compatibility warnings for 9.4?

... I think it should.

It'll break some extensions, so we should warn people about it more
prominently.   Robert's text lower down in the release notes is fine,
but we should put a more prominent warning at the top with the other
backwards compatibility breakage.

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com