def rename(old, new)
      parameters = Specification.new(
        old: Types::Tags,
        new: Types::Tags
      ).parameters(old: old, new: new)
      @client.action('/tags/rename', parameters)
      self
    end
def rename(old, new)
      parameters = Specification.new(
        old: Types::Tags,
        new: Types::Tags
      ).parameters(old: old, new: new)
      @client.action('/tags/rename', parameters)
      self
    end
Rename a tag

 @example
   tags.rename(old, new)

 @param [String] old
   the tag to be renamed
 @param [String] new
   the new name for the tag

 @return [self]

 @api public

 @see https://pinboard.in/api/#tags_rename