chore(deps): update dependency dotenv to v6.2.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
dotenv	devDependencies	minor	6.1.0 -> 6.2.0	source

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Release Notes

motdotla/dotenv

### [`v6.2.0`](https://renovatebot.com/gh/motdotla/dotenv/blob/master/CHANGELOG.md#​620---2018-12-03) [Compare Source](https://renovatebot.com/gh/motdotla/dotenv/compare/v6.1.0...v6.2.0) ##### Added - Support preload configuration via environment variables ([#​351](https://renovatebot.com/gh/motdotla/dotenv/issues/351))

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