Merge pull request sujaykundu777#159 from blakedrumm/patch-2

Fix verbiage, change from `at` to `on`

_includes/blog_post_article.html

@@ -6,7 +6,7 @@ <h4 class="post-meta">{{ page.summary }}</h4>
       Posted by : {% if page.author %}
       <span itemprop="author" itemscope itemtype="http://schema.org/Person">
         <span itemprop="name"><a href="{{site.url}}{{site.baseurl}}/blog/authors/{{page.author}}">{{ page.author }}</a></span> </span
-      >{% endif %} at
+      >{% endif %} on
       <time datetime="{{ page.date }}" itemprop="datePublished"
         >{{ page.date | date: "%b %-d, %Y" }}</time
       >