Update dependency webpack-cli to v3.3.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
webpack-cli	devDependencies	patch	3.3.5 -> 3.3.6

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Release Notes

webpack/webpack-cli

### [`v3.3.6`](https://togithub.com/webpack/webpack-cli/releases/v3.3.6) [Compare Source](https://togithub.com/webpack/webpack-cli/compare/v3.3.5...v3.3.6) Webpack CLI v3.3.6 is a security patch that fixes vulnerabilities. Please upgrade if not done so already. A full changelog available [here](https://togithub.com/webpack/webpack-cli/blob/master/CHANGELOG.md#​336-2019-07-14) Stay safe🙏🏽

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