fix(plugins): add trailing slash to url so it doesn't 404

Author: keithamus

plugins/index.html

@@ -19,7 +19,7 @@
     {% for plugin_hash in site.data.plugins %}
     {% assign plugin = plugin_hash[1] %}
     <article id="{{ plugin.name }}" class="grid_3 contrast plugin-box_s" data-keywords="{{ plugin.keywords | jsonify | escape }}">
-      <a href="{{ site.baseurl }}/plugins/{{ plugin.name }}" class="ablock">
+      <a href="{{ site.baseurl }}/plugins/{{ plugin.name }}/" class="ablock">
         <div class="wrap">
           <h3 class="fancy">{{ plugin.name }}</h3>
           <p>{{ plugin.description }}</p>