(minor) Notes without blank line at end of document aren't parsed

[Omikhleia]

Found by @jslabovitz (via discussion)

If a (foot)note is the last element in a document, without blank line(s) after it, it fails to be parsed.

Test for reproducing

local lunamark = require("lunamark")
local opts = { notes = true }
local writer = lunamark.writer.html5.new(opts)
local parse = lunamark.reader.markdown.new(writer, opts)
local result, matadata = parse([[
Here is a note.[^mynote]

[^mynote]: This is supposed to be the note's footnote.
]])

print(result)

Observed result

<p>Here is a note.[^mynote]</p>

[^mynote]: This is supposed to be the note&#39;s footnote.

Expected result

<p>Here is a note.<sup><a href="#fn1" class="footnoteRef" id="fnref1">1</a></sup></p>

<hr />

<ol class="notes">
<li id="fn1"><p>This is supposed to be the note&#39;s footnote. <a href="#fnref1" class="footnoteBackLink">↩</a></p></li>
</ol>

Rationale

For comparison, Pandoc is happy parsing the note whether there's a blank line or not.

The workaround is easy (just adding a blank line), but it could be misleading to users.