Updated python-lxml packages fix security vulnerability:

The clean_html() function, provided by the lxml.html.clean module,
did not properly clean HTML input if it included non-printed characters
(x01-x08). A remote attacker could use this flaw to serve malicious
content to an application using the clean_html() function to process
HTML, possibly allowing the attacker to inject malicious code into
a website generated by this application (CVE-2014-3146).