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Set notification options for the system notifications.
You can set multiple notifications, which allows you to show local
system notifications and remote notifications with separate libraries.
You can also pass `:off` as library to turn off notifications.

@example Define multiple notifications
  notification :ruby_gntp
  notification :ruby_gntp, host: ''

@param [Symbol, String] notifier the name of the notifier to use
@param [Hash] options the notification library options

@see Guard::Notifier for available notifier and its options.
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