def highlight!(group, attributes={})
      highlight(group, attributes.dup.tap { |hash| hash[:force] = true })
    end
def highlight!(group, attributes={})
      highlight(group, attributes.dup.tap { |hash| hash[:force] = true })
    end
Add or update a forced highlight

 @example
   scheme.highlight!(:Normal, fg: 'eee', bg: '333').force? # => true

 @param [Hash] attributes
   the attributes to set or update

 @return [Vic::Highlight]
   the highlight

 @api public