Bug with Lines starting with comment

[RobertDober]

fix or refute pragdave/earmark#361

iex(10)> Earmark.as_ast "<!-- Replace with better image -->  anything that follows the comment is lost <img src=\"picture.png\"/>"
{:ok, [comment: [" Replace with better image "]], []}

iex(11)> Earmark.as_ast "<img src=\"picture.png\"/> <!-- Replace with better image --> this is not lost"                          
{:ok,
 [
   {"img", [{"src", "picture.png"}], [], %{meta: %{verbatim: true}}},
   "<!-- Replace with better image --> this is not lost"
 ], []}

[bradhanks]

I might have a fix for this.