Update dependency webpack-cli to v3.3.7

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
webpack-cli	devDependencies	patch	3.3.6 -> 3.3.7

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Release Notes

webpack/webpack-cli

### [`v3.3.7`](https://togithub.com/webpack/webpack-cli/releases/v3.3.7) [Compare Source](https://togithub.com/webpack/webpack-cli/compare/v3.3.6...v3.3.7) Version 3.3.7 comes with vulnerability patches and a bugfix to using the CLI when there is no configuration file present. A full changelog found [here](https://togithub.com/webpack/webpack-cli/blob/master/CHANGELOG.md#​337-2019-08-18)

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