Displaces the image based on the provided displacement map
Usage
- @param {object} map the source Jimp instance
 - @param {number} offset the maximum displacement value
 - @param {function(Error, Jimp)} cb (optional) a callback for when complete
 
import jimp from 'jimp';
async function main() {
  const image = await jimp.read('test/image.png');
  // Make me better!
  image.displace(map, 10);
}
main();
