fix downcase

_layouts/blog.html

@@ -58,8 +58,8 @@ css: blog
 
 		  {% if paginator.total_pages > 1 %}
 		  {% if page.category %}
-			{% assign path = "/category/:cat/page:num.html" | replace: ":cat", page.category %}
-			{% assign index = "/category/:cat/index.html" | replace: ":cat", page.category %}
+			{% assign path = "/category/:cat/page:num.html" | replace: ":cat", page.category | downcase %}
+			{% assign index = "/category/:cat/index.html" | replace: ":cat", page.category | downcase %}
 		  {% else %}
 			{% assign path = site.paginate_path %}
 			{% assign index = "/blog/index.html"%}