fix(express-engine): node 9 strict engine error

[MarkPieszak]

closes #851

[Toxicable]

could you add 9 to the .travis.yml
https://github.com/angular/universal/blob/master/.travis.yml#L2

[davidloiret]

Any update? @MarkPieszak could you please sign the CLA?

[vytautas-pranskunas-]

Any progress on this?

[Toxicable]

@MarkPieszak Looks like you have some CLA issue
needa rebase onto master
and add it to travis

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