README Correction - export DEFAULT class...

[nadnoslen]

The README's > 4.x section has a type; should read export default class ... ... the default is missing.

This can lead to strange message about not being able to find router:main at runtime.

This is the section of the README that needs correction:

Usage > 4.x

Users do not need to import and extend from ember-router-scroll anymore. In order to upgrade, you should remove this > import.

This is what your router.js should look like.

import EmberRouter from '@ember/routing/router';

export class Router extends EmberRouter {
 ...
}

[nadnoslen]

See #279 for fix

[snewcomer]

Thank you!!