Add a / to href for HTML compliance

layouts/_default/single.html

       <div class="col-lg-8 offset-lg-2 text-center">
         <h1>{{ .Title }}</h1>
         <ul class="list-inline mb-50">
-          <li class="list-inline-item"><a href="{{ `author/` | relLangURL }}{{ .Params.Author | urlize }}">{{ .Params.Author }}</a></li>
+          <li class="list-inline-item"><a href="{{ `author/` | relLangURL }}{{ .Params.Author | urlize }}/">{{ .Params.Author }}</a></li>
           <li class="list-inline-item">{{ dateFormat "Monday, Jan 2, 2006" .Date }}</li>
         </ul>
         <img class="img-fluid mb-50" src="{{ .Params.Image | absURL }}" alt="blog-image">
   </div>
 </section>
 
-{{ end }}
+{{ end }}