fix note markdown

[evilz]

fix missing export of note

[codecov-io]

Codecov Report

Merging #310 into master will decrease coverage by 0.5%.
The diff coverage is 4%.

@@            Coverage Diff             @@
##           master     #310      +/-   ##
==========================================
- Coverage   11.42%   10.92%   -0.51%     
==========================================
  Files          19       19              
  Lines         455      476      +21     
  Branches       64       66       +2     
==========================================
  Hits           52       52              
- Misses        398      419      +21     
  Partials        5        5

Impacted Files	Coverage Δ
src/Container.ts	0% <0%> (ø)	⬆️
src/RevealServer.ts	0% <0%> (ø)	⬆️
src/Markdown-it.ts	0% <0%> (ø)	⬆️
src/SlideParser.ts	89.36% <100%> (ø)	⬆️

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[evilz]

Fix

• 4.0.2 fragment html comment won't work #301
• 4.0.2 not recognizing notes  #295
• 4.0.2 is regressing on my presentation, 3.4.x worked fine #291