Add PostgreSQL 10

[md5]

This PR adds a PostgreSQL 10 image. It builds on the branch from #66.

Closes #64

[md5]

And of course now there's a 10.1 release of PostgreSQL... https://www.postgresql.org/docs/10/static/release-10-1.html

[md5]

On second glance, it looks like the way they handle versioning for PostgreSQL has changed, so this doesn't warrant a separate image.

[ImreSamu]

And of course now there's a 10.1 release of PostgreSQL...

:)

fresh docker images ...

• postgres:10.1 = 117 MB
• 10.1-alpine = 14 MB

https://hub.docker.com/r/library/postgres/tags/