add url

Author: gitcheng

_config.yml

@@ -38,7 +38,7 @@ google_analytics: UA-58930825-1
 
 # Your website URL (e.g. http://barryclark.github.io or http://www.barryclark.co)
 # Used for Sitemap.xml and your RSS feed
-url: 
+url: http://gitcheng.github.io/
 
 # If you're hosting your site at a Project repository on GitHub pages 
 # (http://yourusername.github.io/repository-name)