1) removed bytecode and eggs from package (export PYTHONPYCACHEPREFIX="$HOME/.cache/pycache/" if you need .pyc boost)
2) restored licence, it is not a bsd2 but a bsd2 with personalizzation at the end:
  "...The views and conclusions contained in the software and documentation are those of the
   authors and should not be interpreted as representing official policies, either expressed
   or implied, of the stakeholders of the xonsh project or the employers of xonsh developers."