Update docker-compose.yml (#2905)
Update docker-compose.yml (#2905)

* Update docker-compose.yml

jut updating docker-compose dev to version 3, any special reason to keep redis on 3? and pg on 9.5? I could also add a volume to pg, any reason not to do so?

* rollback to redis 3 and pg 9.5 due to consistency in project defaults

* Configure volume directly in worker service.

denisov-vlad/redash,chriszs/redash,getredash/redash,denisov-vlad/redash,getredash/redash,denisov-vlad/redash,getredash/redash,chriszs/redash,denisov-vlad/redash,getredash/redash,denisov-vlad/redash,chriszs/redash,alexanderlz/redash,chriszs/redash,alexanderlz/redash,getredash/redash,alexanderlz/redash,alexanderlz/redash