Guard::Notifier::Base#normalize_standard_options!

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Set or modify the `:title`, `:type` and `:image` options for a
notification. Should be used in `#notify`.

@param [Hash] opts additional notification library options
@option opts [String] type the notification type. Either 'success',
  'pending', 'failed' or 'notify'
@option opts [String] title the notification title
@option opts [String] image the path to the notification image
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