ES6+ style registration by simply importing 'source-map-support/register'

[koistya]

For those using ES6+ syntax, it would be better to register source-map-support with:

import 'source-map-support/register';

instead of

require('source-map-support').install();

[julien-f]

I agree, and this would be very useful to automatically add source maps support to unit tests:

> mocha --require source-map-support/register