PostgreSQL homebrew로 9.3 에서 9.4 로 upgrade 하기

Mac home-brew update & upgrade를 하면 PostgreSQL 이 버젼업 되는데 아래와 같은 에러가 난다.

LOG:  skipping missing configuration file "/usr/local/var/postgres/postgresql.auto.conf"
FATAL:  database files are incompatible with server
DETAIL:  The data directory was initialized by PostgreSQL version 9.3, which is not compatible with this version 9.4.0.

이때 아래 사이트를 따라하면 해결됨.

http://rcmachado.github.io/postgres/postgis/2014/12/20/upgrading-postgresql-using-homebrew.html