No example of configuration options?

[AndrewRayCode]

The main gem https://github.com/Houdini/two_factor_authentication shows:

Set config values in config/initializers/devise.rb:

config.max_login_attempts = 3  # Maximum second factor attempts count.
...

However, this example doesn't use the config options. When I try to run any rails command, I get

config/initializers/devise.rb:287:in `block in <top (required)>': undefined method `max_login_attempts=' for Devise:Module (NoMethodError)