CommonMark bullet markers and lazy list continuations are not parsed #35

Reproducers

$markdown = new Tempest\Markdown\Markdown(null);
$markdown->parse("* First\n* Second")->html;
$markdown->parse("- First\ncontinued on the next line")->html;

In 1.2.3, the first input becomes a paragraph because the list rule only recognizes -. The second becomes a list followed by a paragraph, although the unindented line is a lazy continuation of the list item under CommonMark. The + bullet marker has the same gap as *.

These forms appear in existing Markdown content, so a renderer aiming for CommonMark compatibility cannot delegate them to Tempest yet.