add u-uri to h-card

Author: tonywok

_includes/footer.html

@@ -1,5 +1,5 @@
 <footer class="site-footer h-card">
-  <data class="u-url" href="{{ "/" | relative_url }}"></data>
+  <data class="u-url u-uid" href="{{ "/" | relative_url }}"></data>
 
   <div class="wrapper">
 

_site/index.html

@@ -129,7 +129,7 @@ <h2>
 </div>
       </div>
     </main><footer class="site-footer h-card">
-  <data class="u-url" href="/"></data>
+  <data class="u-url u-uid" href="/"></data>
 
   <div class="wrapper">