[LCA2015-Chat] Update on Postgres Replication Tutorial

[Josh Berkus]

For those attending the PostgreSQL Tutorial tommorrow:

The docker image I previously posted was missing vi and nano editors.
If you already pulled the docker image, and you would prefer to use vi
or nano as your text editor for the tutorial, please do:

docker pull jberkus/pgreplicationtutorial:latest

... in order to get an updated image where those editors are present.

See you tommorrow!