chore(awslint): add missing semicolon

[alngy]

Minor syntax fix. I found it when testing out the linters.

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[eladb]

how did it ever compile?

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[alngy]

how did it ever compile?

https://github.com/aws/aws-cdk/blob/master/tools/awslint/package.json#L8
It seems like tslint isn't part of the build script

Pull request has been modified.

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