Merge pull request #59 from mbentley/synology-note

Added note about upgrading on a Synology NAS; fixes #57

README.md

@@ -39,6 +39,7 @@ The upgrade to the 4.1.x version is not a seamless upgrade and can't be done in
 
 1. **Ports** - Do not change the ports for the controller or portal in the UI to ports below 1024 unless you have adjusted the unprivileged ports; for ports < 1024, see [Unprivileged Ports](#unprivileged-ports).  If you change the default port for the management interface, you should also either disable the container health check or update it to the new port.
 1. **SSL Certificates** - if you are installing your own SSL certificates, you should only manage them using one method - through the UI or by using the `/cert` volume as [described below](#custom-certificates).
+1. **Synology Users** - if you're using a Synology and are using the `latest` tag and update to 4.1, you will need to make sure to re-create the container due to the `CMD` changing from older versions to 4.1 as Synology retains the entrypoint and command from the container as it is defined and not from the image.
 
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