Announcing LTSP 20.06

Copied from https://github.com/ltsp/ltsp/issues/1#issuecomment-646456866

## Announcing LTSP 20.06

A new version LTSP 20.06 is available in the [proposed 
PPA](https://ltsp.org/advanced/proposed-ppa/). Please test and verify 
that it doesn't cause any issues for you, as it will be uploaded in the 
[stable PPA](https://ltsp.org/docs/ppa/) and in [Debian 
testing](https://packages.debian.org/bullseye/ltsp) in a few days.

Changelog from the previous version:

   [ Alkis Georgopoulos ]
   * Use sftp auth to allow disabling ssh logins (#128)
   * Set upstream metadata fields (#129)
   * Support multiseat (#133)
   * Support netbooting without an initrd (#68)
   * Default to READ_AHEAD_KB=128 (#27)
   * Add simple NFS_HOME example in ltsp-nfs.5.md


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