Typo in API.md link

README.md

@@ -5,7 +5,7 @@
 A server to provide common profile-related data for a Firefox Account.
 Such as name, avatar, location, age, gender, [etc](https://wiki.mozilla.org/Identity/Firefox-Accounts#What_information_does_Firefox_Accounts_store_about_the_user.3F_Can_I_use_it_to_store_user_data_for_my_application_or_service.3F).
 
-- [API](./docs/api.md)
+- [API](./docs/API.md)
 
 ## Development