I want to use "backo2" but the Copyright phrase is not specified. Please update the Copyright phrase on the source code.

Hi,

I noticed that this package declares in package.json that it is licensed using the MIT license, but as there is no license file and subsequently no copyright notice this isn't valid MIT license. The MIT license itself says that I need to have the copyright notice in any copies. There would be no copyright notice without the full license and thus render the license invalid:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

As such, the npm package on NPM registry does not contain a license file and doing npm install backo would create an illegal copy of the package without the copyright notice which is against the MIT license.

Can you please add a license file with the appropriate copyright notice and release this as an update to the NPM package registry.

E.g. in https://github.com/segmentio/backo/blob/master/index.js#L38
perhaps try something like:

if (this.jitter) {
  var rand =  Math.random();
  var deviation = rand * this.jitter * ms; // 0 <= jitter <= 1
  ms = (Math.floor(rand * 10) & 1) == 0  ? ms - deviation : ms + deviation;  // so jitter is uniformly distributed on both sides
}