Update README.md

README.md

@@ -16,7 +16,7 @@ Role Variables
 --------------
 
 The variables that can be passed to this role and a brief description about
-them are as follows. (For all variables, take a look at defaults/main.yml)
+them are as follows. (For all variables, take a look at [defaults/main.yml](defaults/main.yml))
 
 ```yaml
 # The user to run nginx