Update _config.yml

Author: dkch777

_config.yml

@@ -16,7 +16,7 @@ timezone:
 
 title: Seunghyun's Blog # the main title
 
-tagline: A text-focused Jekyll theme # it will display as the subtitle
+tagline: Driving HCI forward through technical innovation and user-centered system design # it will display as the subtitle
 
 description: >- # used by seo meta and the atom feed
   A minimal, responsive and feature-rich Jekyll theme for technical writing.