bug? re lookbehind assertions in Annex B

[jmdyck]

When lookbehind assertions were introduced in bf8a9be (PR #1029), there was no change to Annex B.

Later, e5b6605 (PR #1102) added lookbehind assertions to the 'Assertion' production in Annex B.

However, I think Annex B needs one more collateral change. The original PR added the direction parameter to the evaluate semantics for Disjunction, Alternative, Term, Atom, and AtomEscape, and also added it to the parameter list for CharacterSetMatcher. Annex B picks up most of these changes implicitly, but I believe it needs to add the _direction_ parameter to the calls to CharacterSetMatcher in the two evaluation rules for ExtendedAtom.

Attn @mathiasbynens, @littledan, @claudepache, @IgnoredAmbience ?

[mathiasbynens]

Yeah, that makes sense to me. Thanks for catching this!