Async highlighting is broken in 8.1

[EugenePisotsky]

Async highlight is not working after upgrade to 8.0 (or 8.1) for methods

    public async asyncResponse(): Promise<Object> {
        return {
            promiseResult: 'promise is ok'
        }
    }

also, class keyword now looks like storage type ts in this example:

export class IndexController extends AppController {
...

[basarat]

Please create an issue at https://github.com/Microsoft/TypeScript-TmLanguage/issues and link back here 🌹

[basarat]

I've added grammar docs https://github.com/TypeStrong/atom-typescript/blob/master/docs/grammar.md#cson-grammar to help everyone know what's going on 🌹