cleaner circle CI badge

looks good :)

Author: bkendall

README.md

@@ -1,5 +1,4 @@
-[![Status Badge](https://circleci.com/gh/CodeNow/api.png?circle-token=15c68bfd7d9ca99637f0c5a6e05505366f5d9fd3)](https://circleci.com/gh/CodeNow/api)
-
+[![Circle CI](https://circleci.com/gh/CodeNow/api.svg?style=svg&circle-token=15c68bfd7d9ca99637f0c5a6e05505366f5d9fd3)](https://circleci.com/gh/CodeNow/api)
 
 Application Components
 ==========