gfm_auto_identifiers extension doens't work with emoji

[luispuerto]

pandoc 2.7.4
Compiled with pandoc-types 1.17.5.4, texmath 0.11.2.2, skylighting 0.8.2
Default user data directory: /Users/lpuerto/.local/share/pandoc or /Users/lpuerto/.pandoc
Copyright (C) 2006-2019 John MacFarlane
Web: http://pandoc.org
This is free software; see the source for copying conditions.
There is no warranty, not even for merchantability or fitness
for a particular purpose.

### Jekyll Plugins & Gems :gem:

<h3 id="jekyll-plugins--gems-">Jekyll Plugins &amp; Gems <span class="emoji" data-emoji="gem">💎</span></h3>

It should have resulted in:

<h3 id="jekyll-plugins--gems-gem">Jekyll Plugins &amp; Gems <span class="emoji" data-emoji="gem">💎</span></h3>

[luispuerto]

You're fast!