Properly handle emoji in database

[j0k3r]

Some release message includes emoji (of course), like the release 0.6.1 of Medis:

The Github endpoint for convertir markdown to html convert it to:

<g-emoji alias="smiley" fallback-src="https://assets-cdn.github.com/images/icons/emoji/unicode/1f603.png" ios-version="6.0">😃</g-emoji>

but it is saved like that in MySQL:

<g-emoji alias="smiley" fallback-src="https://assets-cdn.github.com/images/icons/emoji/unicode/1f603.png" ios-version="6.0">?</g-emoji>

Even if the database & table & field are set to utf8bm4 & utf8bm4_unicode_ci 😞

{"collate"="utf8mb4_unicode_ci", "charset"="utf8mb4"}