def highlight(group, attributes={})
      if hilight = find_highlight(group)
        hilight.update_attributes!(attributes)
      else
        hilight = Highlight.new(:"#{ language }#{ group }", attributes)
        @highlights << hilight
      end

      hilight
    end
def highlight(group, attributes={})
      if hilight = find_highlight(group)
        hilight.update_attributes!(attributes)
      else
        hilight = Highlight.new(:"#{ language }#{ group }", attributes)
        @highlights << hilight
      end

      hilight
    end
Add or update a highlight

 @example
   scheme.highlight(:Normal, fg: 'eee', bg: '333')

 @param [String,Symbol] group
   the group to highlight

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

 @return [Vic::Highlight]
   the highlight

 @api public