password parameter was missing
### Register a User
-Run `mix register_user <name> <nickname> <email> <bio>`. The `name` appears on statuses, while the nickname corresponds to the user, e.g. `@nickname@instance.tld`
+Run `mix register_user <name> <nickname> <email> <bio> <password>`. The `name` appears on statuses, while the nickname corresponds to the user, e.g. `@nickname@instance.tld`
### Password reset