Change logs for mma source package in Lunar

mma (21.09-1) unstable; urgency=medium

  * New upstream version 21.09
  * Bump Standards-Version to 4.6.0
  * Bump d/copyright year
  * d/upstream/metadata: Remove unsupported homepage field

 -- Dennis Braun <email address hidden>  Mon, 04 Oct 2021 22:35:43 +0200