Replace es6-shim with core-js

[jdonenine]

Recently Angular2 removed their dependency on the es6-shim module so that core-js could be used in it's place. The es6-shim module has licensing issues which prevent it from being commercially distributed. Would it be possible to change your dependency to be on the core-js shim library instead of es6-shim?

[afrad]

Could you please create a pull request?

[jdonenine]

Done. https://github.com/afrad/angular2-websocket/pull/21

[jb-int]

I'm using ionic 2 and it's starters don't come with core-js, but it looks like it does do polyfills somehow. Maybe just remove the peer dependency?

[jb-int]

Ionic 2 also can't do Typescript 2.1+ yet. It's stuck on 2.0.9. Can you lower the dependency or does it really need to be 2.1+?