function normalize (options) {
  return this.normalise(options);
}
Alternative spelling of normalise.

@example
const output = await sharp(input)
  .normalize()
  .toBuffer();

@param {Object} [options]
@param {number} [options.lower=1] - Percentile below which luminance values will be underexposed.
@param {number} [options.upper=99] - Percentile above which luminance values will be overexposed.
@returns {Sharp}