feat: updated date parsing logic

_includes/post.njk

@@ -6,7 +6,7 @@ layout: base.njk
   <header class="post-header">
     <h1>{{ title }}</h1>
     <time datetime="{{ createdAt | dateFormat }}">{{ createdAt | dateFormat }}</time>
-    {% if updatedAt %}
+    {% if updatedAt and (updatedAt | isMoreThanHourAfter(createdAt)) %}
     <p class="updated-at">Updated: <time datetime="{{ updatedAt | dateFormat }}">{{ updatedAt | dateFormat }}</time></p>
     {% endif %}
   </header>