Fix #145 by upgrading html5lib
Fix #145 by upgrading html5lib

Require an html5lib version that has a work-around for the original Python bug.
jasco/WeasyPrint,marclaporte/WeasyPrint,Kozea/WeasyPrint,prepare/TestWeasyPrint,andrewleech/WeasyPrint,marclaporte/WeasyPrint,andrewleech/WeasyPrint,prepare/TestWeasyPrint,Kozea/WeasyPrint,jasco/WeasyPrint