Fix link

Closes #21

Author: lpil

README.md

@@ -15,7 +15,7 @@ Examples showing how to do many things in Gleam!
 ## Cryptography
 
 - [Hashing data](./universal/test/cryptography/hashing_data.gleam)
-- [Hashing passwords](./universal/test/cryptography/hashing_passwords.gleam) (Erlang)
+- [Hashing passwords](./erlang/test/cryptography/hashing_passwords.gleam) (Erlang)
 
 ## Data structures