cantor 4:19.08.3-1 source package in Debian

Changelog

cantor (4:19.08.3-1) unstable; urgency=medium

  * Team upload.
  * New upstream release.
  * Drop the Python 2 backend, as Python 2 will be removed from Debian:
    (Closes: #936271)
    - drop the cantor-backend-python2 binary
    - remove the python-dev build dependency
    - remove the cantor-backend-python2 suggest in cantor, and stop mentioning
      it in the description
  * Update almost all the URLs to https:
    - use the actual homepage of Qalculate
    - leave the homepage of Maxima as http, as https is not supported

 -- Pino Toscano <email address hidden>  Wed, 13 Nov 2019 21:47:09 +0100