Add a "not yet released" note on 2.0.0 in docs (#790).

docs/how-to/add-preparation-and-cleanup-steps-to-backups.md

@@ -17,9 +17,9 @@ points as it runs.
 feature](https://torsion.org/borgmatic/docs/how-to/backup-your-databases/)
 instead.)
 
-<span class="minilink minilink-addedin">New in version 2.0.0</span> Command
-hooks are now configured via a list of `commands:` in your borgmatic
-configuration file. For example:
+<span class="minilink minilink-addedin">New in version 2.0.0 (not yet
+released)</span> Command hooks are now configured via a list of `commands:` in
+your borgmatic configuration file. For example:
 
 ```yaml
 commands: