chore(deps): update typescript-eslint monorepo to v2.4.0

This MR contains the following updates:

Package	Type	Update	Change
@typescript-eslint/eslint-plugin	devDependencies	minor	2.3.3 -> 2.4.0
@typescript-eslint/parser	devDependencies	minor	2.3.3 -> 2.4.0

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