Fix keybase class (mmistakes#3221)

* Fix keybase class

* Fix fas->fab

Author: amcintosh

_includes/author-profile.html

@@ -59,7 +59,7 @@ <h3 class="author__name p-name" itemprop="name">
       {% if author.keybase %}
         <li>
           <a href="https://keybase.io/{{ author.keybase }}" itemprop="sameAs" rel="nofollow noopener noreferrer me">
-            <i class="fas fa-fw fa-key" aria-hidden="true"></i><span class="label">Keybase</span>
+            <i class="fab fa-fw fa-keybase" aria-hidden="true"></i><span class="label">Keybase</span>
           </a>
         </li>
       {% endif %}