add dblp to social links (alshedivat#270)

Author: pazz

_includes/social.html

@@ -14,3 +14,4 @@
 {% if site.strava_userid %}<a href="https://www.strava.com/athletes/{{ site.strava_userid }}" target="_blank" title="Strava"><i class="fab fa-strava"></i></a>{% endif %}
 {% if site.keybase_username %}<a href="https://keybase.io/{{ site.keybase_username }}" target="_blank" title="Keybase"><i class="fab fa-keybase"></i></a>{% endif %}
 {% if site.gitlab_username %}<a href="https://gitlab.com/{{ site.gitlab_username }}" target="_blank" title="GitLab"><i class="fab fa-gitlab"></i></a>{% endif %}
+{% if site.dblp_url %}<a href="{{ site.dblp_url }}" target="_blank" title="DBLP"><i class="ai ai-dblp"></i></a>{% endif %}