Fix grammar

Author: tannerwelsh

_includes/contact.html

@@ -10,7 +10,7 @@ <h2>Contact us</h2>
           <div class="fbox-icon">
             <a href="mailto:{{ site.contact_email }}"><i class="icon-email"></i></a>
           </div>
-          <h3>Sends us an email<span class="subtitle"><a href="mailto:{{ site.contact_email }}">{{ site.contact_email }}</a></span></h3>
+          <h3>Send us an email<span class="subtitle"><a href="mailto:{{ site.contact_email }}">{{ site.contact_email }}</a></span></h3>
         </div>
       </div>