Add brcypt GitHub to Lab notes

week_6/notes_week_6.md

@@ -94,6 +94,8 @@ is storing passwords in plaintext though. Modify it to:
 - Store hashes created with `bcrypt`
 - Store a unique salt for each row that's used to create the hash
 - Incorporate a pepper stored in a config file
+
+https://github.com/pyca/bcrypt/
 ---
 
 # Single Page Applications