Update _config.yml

Author: myandroidgithub

_config.yml

@@ -20,7 +20,7 @@ description: > # this means to ignore newlines until "baseurl:"
   line in _config.yml. It will appear in your document head meta (for
   Google search results) and in your feed.xml site description.
 baseurl: "" # the subpath of your site, e.g. /blog
-url: "" # the base hostname & protocol for your site, e.g. http://example.com
+url: "https://geyuankai.github.io/" # the base hostname & protocol for your site, e.g. http://example.com
 twitter_username: jekyllrb
 github_username:  jekyll