Bump @types/mocha from 2.2.48 to 5.2.0

[dependabot-preview[bot]]

Bumps @types/mocha from 2.2.48 to 5.2.0.

Commits

- See full diff in [compare view](https://github.com/DefinitelyTyped/DefinitelyTyped/commits)

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[dependabot-preview[bot]]

Superseded by #35.