Correct forkChecker ats config option to speed up reloads

[texel]

The option for awesome-typescript-loader to fork the type checker is forkChecker, not useForkChecker. This change forks the type checker, and drastically lowers reload times (from ~4sec to ~1.5sec on a new project on my machine).

[googlebot]

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[texel]

@googlebot CLA signed under the corporation "Distributed Creation". Email address in these commits should be covered. Thanks!

[Meligy]

Weird. It's still not happening.

I'm not sure whether it's taking your git commit commit author email or your github profile email (which is public from what I can see).

[filipesilva]

Restarted travis, and trying to get someone to look at the CLA.

[maximedupre]

Will this be available in the next version (1.0.0-beta.19-4/1.0.0-beta.20)?

[hansl]

Yes.

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