Log Message:
Update py-lxml to 3.6.0.

3.6.0 (2016-03-17)
==================

* GH#189: Static builds honour FTP proxy configurations when downloading
  the external libs.  Patch by Youhei Sakurai.

* GH#187: Now supports (only) version 5.x and later of PyPy.
  Patch by Armin Rigo.

* GH#186: Soupparser failed to process entities in Python 3.x.
  Patch by Duncan Morris.

* GH#185: Rare encoding related `TypeError` on import was fixed.
  Patch by Petr Demin.

* GH#181: Direct support for `.rnc` files in `RelaxNG()` if `rnc2rng`
  is installed.  Patch by Dirkjan Ochtman.