Revert eb95a71 "[commonmark] BREAKING CHANGE: link nesting is not allowed. If multiple links are nested, the innermost one is used." I don't like the cm rule for nested links. NON-COMPLIANT with commonmark.
Revert eb95a71 "[commonmark] BREAKING CHANGE: link nesting is not allowed. If multiple links are nested, the innermost one is used."
I don't like the cm rule for nested links.
NON-COMPLIANT with commonmark.

chjj/marked,chjj/marked