Document ARM releases on docker hub

This is now confirmed to be working so fixes #38

README.md

@@ -35,10 +35,12 @@ A minimal forward authentication service that provides OAuth/SSO login and authe
 
 ## Releases
 
-We recommend using the `2` tag on docker hub.
+We recommend using the `2` tag on docker hub (`thomseddon/traefik-forward-auth:2`).
 
 You can also use the latest incremental releases found on [docker hub](https://hub.docker.com/r/thomseddon/traefik-forward-auth/tags) and [github](https://github.com/thomseddon/traefik-forward-auth/releases).
 
+ARM releases are also available on docker hub, just append `-arm` or `-arm64` to your desired released (e.g. `2-arm` or `2.1-arm64`).
+
 #### Upgrade Guide
 
 v2 was released in June 2019, whilst this is fully backwards compatible, a number of configuration options were modified, please see the [upgrade guide](https://github.com/thomseddon/traefik-forward-auth/wiki/v2-Upgrade-Guide) to prevent warnings on startup and ensure you are using the current configuration.