Removed reference to susy in readme. (#372)

Author: dsjen

README.md

@@ -52,7 +52,6 @@ Also, the Pattern Library currently relies on the following thrd party libraries
 | [Bourbon](https://github.com/thoughtbot/bourbon)                | 4.2.6         | basic sass/CSS utilities                                      |
 | [bi-app-sass](https://github.com/anasnakawa/bi-app-sass)        | latest        | right-to-left/left-to-right directional support for layouts   |  
 | [breakpoint-sass](https://github.com/at-import/breakpoint)      | 2.6.1         | CSS breakpoint/media-query management                         |  
-| [susy](https://github.com/ericam/susy)                          | 2.2.9         | Grid configuration and utilities                              |  
 | [Font Awesome](https://github.com/FortAwesome/Font-Awesome)     | 4.6.3         | Accessibility-minded iconic font |  
 
 ## Documentation