adding version tagging information to README

Author: dencold

README.md

@@ -19,6 +19,12 @@ If you have a postgres container already running, all you need to do is link the
 
 You'll get a prompt for password, once authenticated you'll be in a pgcli session. When you exit, the container will automatically be cleaned up.
 
+### Version Notes
+
+In order to guarantee stability, the version for pgcli is pinned in the Dockerfile. The maintainers (currently just @dencold) will work to keep this updated and make sure that things don't break between releases. Both the Docker image on the hub, as well as the git repository will be tagged with the version information and will match what we are pulling from pgcli.
+
+Current version of the repository is **0.19.2**.
+
 ## TODOs
 
 * See if we can reference the `POSTGRES_ENV_POSTGRES_PASSWORD` variable in as an argument to pgcli, this would allow for automatic connection to the instance. Looks like from usage there isn't a password option: