Draft: fix: install xz to allow using lzma

Attempt to resolve #41 by installing xz.

XZ Utils (previously LZMA Utils) is a set of free software command-line lossless data compressors, including the programs lzma and xz, for Unix-like operating systems and, from version 5.0 onwards, Microsoft Windows.

(https://en.wikipedia.org/wiki/XZ_Utils)

This would also need a backport into the v0.2 series.

When using python2, the lzma import succeeds. In addition, an xz exists at /usr/bin/xz even prior to this explicit install added here.