Extension which write-to support for swift-markdown.

Markup+writing.swift

import Foundation
import Markdown

extension Markup {
    func write(to destination: URL, formatOptions: MarkupFormatter.Options = .default, atomically useAuxiliaryFile: Bool = true, encoding: String.Encoding = .utf8) throws {
        let string = format(options: formatOptions)
        try string.write(to: destination, atomically: useAuxiliaryFile, encoding: encoding)
    }
}