README: Update for lxd-to-incus

Signed-off-by: Stéphane Graber <[email protected]>

README.md

@@ -21,10 +21,7 @@ This fork was made in response to [Canonical's takeover](https://linuxcontainers
 
 The main aim of this fork is to provide once again a real community project where everyone's contributions are welcome and no one single commercial entity is in charge of the project.
 
-The fork was done at the LXD 5.16 release, making it possible to upgrade from LXD releases up to and including LXD 5.16.
-Upgrading from a later LXD release may not work as the two projects are likely to start diverging from this point onwards.
-
-Incus will keep monitoring and importing relevant changes from LXD over time though changes and features that are specific to Ubuntu or Canonical's products are unlikely to be carried over.
+A migration tool called `lxd-to-incus` is provided to aid with migrating an existing LXD environment over to Incus.
 
 ## Get started