code: function separatingNewlines (output, replacement) {
    var newlines = [
      output.match(trailingNewLinesRegExp)[0],
      replacement.match(leadingNewLinesRegExp)[0]
    ].sort()
    var maxNewlines = newlines[newlines.length - 1]
    return maxNewlines.length < 2 ? maxNewlines : '\n\n'
  }
docs: Determines the new lines between the current output and the replacement
  @private
  @param {String} output The current conversion output
  @param {String} replacement The string to append to the output
  @returns The whitespace to separate the current output and the replacement
  @type String