Postgres 10 beta support

[piotrkochan]

It'll be nice to release version which supports Postgres 10 beta

 PostgreSQL 10beta1 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 5.3.0-3ubuntu1~14.04) 5.3.0 20151204, 64-bit\n" source="postgres_exporter.go:966" 

[wrouesnel]

Is there a published Docker container on docker hub for it yet (they're the main way the exporter gets tested).

[piotrkochan]

There are 2 Postgres 10beta images in the DockerHub

10-beta2, 10 (10/Dockerfile)
10-beta2-alpine, 10-alpine (10/alpine/Dockerfile)

https://hub.docker.com/_/postgres/