postgreql upgrade 9.5 -> 9.6

gistfile1.txt

brew info postgresql

```
/usr/local/Cellar/postgresql/9.5.4 (3,147 files, 35MB)
  Poured from bottle on 2016-09-05 at 10:59:38
/usr/local/Cellar/postgresql/9.6.2 (3,251 files, 36.5MB) *
  Poured from bottle on 2017-03-13 at 13:20:21
 ```

mkdir /usr/local/var/postgres9.6.2

initdb -D /usr/local/var/postgres9.6.2/
pg_upgrade -d /usr/local/var/postgres -D /usr/local/var/postgres9.6.2/ -b /usr/local/Cellar/postgresql/9.5.4/bin/ -B /usr/local/Cellar/postgresql/9.6.2/bin/ -v

export PGDATA="/usr/local/var/postgres9.6.2"

pg_ctl start