PostgreSQL 10

[eagleflo]

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• Have you checked that there aren't other open pull requests for the same formula update/change?
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I copied the old formula to postgresql@9.6 and updated it based on postgresql@9.5. The bottles for PostgreSQL 9.6 can't be found after the migration to postgresql@9.6, can they be renamed?

PostgreSQL's pg_upgrade also works for migrations across major versions. Updated caveats in main formula to reflect that.

I was able to migrate my databases with:

$ brew services stop postgresql
$ cp -r /usr/local/var/postgres /usr/local/var/postgres@9.6
$ initdb -D /usr/local/var/postgres
$ pg_upgrade -b /usr/local/Cellar/postgresql/9.6.5/bin -B /usr/local/Cellar/postgresql/10.0/bin -d /usr/local/var/postgres@9.6 -D /usr/local/var/postgres
$ brew services start postgresql

After verifying that everything is OK:

$ rm -rf  /usr/local/var/postgres@9.6
$ brew cleanup

[eagleflo]

Tried using assert_predicate instead of File.exists? as suggested by audit, but the test bot didn't like it.

[eagleflo]

Duplicate of #19062.