Fix tests issue
Fix tests issue

This patch fix https://travis-ci.org/funilrys/hosts/jobs/347500695#L397

Please also note that I introduced that patch because
we do not directly use lxml but it is required by
BeautifulSup() to parse the HTML.

StevenBlack/hosts,gfyoung/hosts,gfyoung/hosts,borisschapira/hosts,StevenBlack/hosts