html5lib: enable 3.8, 3.9, remove 3.6
html5lib: enable 3.8, 3.9, remove 3.6

haikuports/haikuports,Begasus/haikuports,haikuports/haikuports,Begasus/haikuports,Begasus/haikuports,moochris/haikuports,haikuports/haikuports,haikuports/haikuports,Begasus/haikuports,haikuports/haikuports,moochris/haikuports,Begasus/haikuports,moochris/haikuports