[Debian-science-sagemath] Python 2 matplotlib package required for sagemath

[Tobias Hansen]

Hi Sandro,

I was just about to finish an update to the sagemath package when you uploaded matplotlib 3.0.2 to unstable. We need the Python 2 package for sagemath (see #917428). Would you be ok with me uploading matplotlib 2.2.3 as a separate source package that provides python-matplotlib? Or would you even want to maintain it?

Best,

Tobias