Update packages even if they're installed on Travis already.
Update packages even if they're installed on Travis already.

mgilson/html5lib-python,mindw/html5lib-python,html5lib/html5lib-python,mgilson/html5lib-python,html5lib/html5lib-python,html5lib/html5lib-python,mindw/html5lib-python,mgilson/html5lib-python,mindw/html5lib-python