fix link on layout

Author: AlecRosenbaum

_layouts/default.html

@@ -17,7 +17,7 @@ <h2 class="project-tagline">{{ site.description | default: site.github.project_t
       {% if site.github.is_project_page %}
         <a href="{{ site.github.repository_url }}" class="btn">View on GitHub</a>
       {% endif %}
-      <a href="{{ site.github.release_url }}" class="btn">Download</a>
+      <a href="{{ site.github.releases_url }}" class="btn">Download</a>
     </section>
 
     <section class="main-content">