Upgrade librecad to 2.1.3 version

[Innocent De Marchi <tangram.peces@gmail.com>]

Hello everyone,

I have recently joined the group. I see that the librecad package is
somewhat outdated [0]: version 2.1.3 has not been packaged and a
version 2.2.0 ~ rc1 has already been published [2].
I can take care of updating this package: The last uploaders of the
package are not as members of the team and I send them a copy of the
mail.

Regards!

I. De Marchi





[0] https://tracker.debian.org/pkg/librecad
[2] https://github.com/LibreCAD/LibreCAD/releases