Update README.md

Author: btoms20

README.md

@@ -48,7 +48,7 @@ multibase comes in. It answers the question:
 - I wouldn't use this in production until you've vetted it yourself! 
 
 #### For more details see 
-- [Multiformats / Mulitbase Spec]
+- [Multiformats / Mulitbase Spec](https://github.com/multiformats/multibase)
 
 
 ## Install