Announcing LTSP 20.01

Copied from https://github.com/ltsp/ltsp/issues/1#issuecomment-578984993

## Announcing LTSP 20.01

A new version LTSP 20.01 has been uploaded to Debian Unstable, Ubuntu 
Focal and the [LTSP PPA](https://ltsp.org/docs/ppa/).

Changelog from the previous version:

   [ Alkis Georgopoulos ]
   * Permit netbooting by just copying the /usr/share/ltsp directory
   * Allow separate boot partition (#43)
   * Server-side support for Raspberry Pis (#68)
   * Introduce ADD_IMAGE_EXCLUDES and OMIT_IMAGE_EXCLUDES (#83)
   * Avoid warning when unlocking screensaver
   * If systemd units cannot be disabled, warn without failing
   * Don't activate debug_shell while inside a subshell
   * Avoid partprobe race condition (#112)

   [ Vagrant Cascadian ]
   * debian/copyright: Use https URL for gnu.org licenses page
   * docs/ltsp.conf: Fix spelling of "overridden".
   * debian/control: Update Standards-Version to 4.5.0, no changes.
   * Make cups mask only warn on failure.
   * Add cups.path and cups.socket to default masked services.


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