chore(deps): update dependency webpack-cli to v3.3.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
webpack-cli	devDependencies	patch	3.3.3 -> 3.3.4

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Release Notes

webpack/webpack-cli

### [`v3.3.4`](https://togithub.com/webpack/webpack-cli/blob/master/CHANGELOG.md#​334-2019-06-11) [Compare Source](https://togithub.com/webpack/webpack-cli/compare/3.3.3...v3.3.4) [Full Changelog](https://togithub.com/webpack/webpack-cli/compare/3.3.3...3.3.4) #### New Features - add workbox + offline support ([589253e](https://togithub.com/webpack/webpack-cli/commit/589253e)) - better defaults ([77bf564](https://togithub.com/webpack/webpack-cli/commit/77bf564)) #### Chore - fix prompt ([478340d](https://togithub.com/webpack/webpack-cli/commit/478340d)) - improved err msg ([23eddcb](https://togithub.com/webpack/webpack-cli/commit/23eddcb)) - removed the commented statement ([bf0efa5](https://togithub.com/webpack/webpack-cli/commit/bf0efa5)) - remove unused dep ([7dd8ff2](https://togithub.com/webpack/webpack-cli/commit/7dd8ff2)) - fix sec vuln ([545ef3a](https://togithub.com/webpack/webpack-cli/commit/545ef3a)) - fix sec vuln ([4760125](https://togithub.com/webpack/webpack-cli/commit/4760125)) - readd docs ([830eaf3](https://togithub.com/webpack/webpack-cli/commit/830eaf3)) - reset prompting for cmd ([a16f8dc](https://togithub.com/webpack/webpack-cli/commit/a16f8dc)) - remove unused file ([a0a06b3](https://togithub.com/webpack/webpack-cli/commit/a0a06b3)) #### Docs - added auto flag in docs for init command ([dede7d8](https://togithub.com/webpack/webpack-cli/commit/dede7d8)) #### Fix - module not found error ([a2062f2](https://togithub.com/webpack/webpack-cli/commit/a2062f2)) - remove unused pkgs and refactor init generator ([7608d4b](https://togithub.com/webpack/webpack-cli/commit/7608d4b)) #### Tests - fix failing ones ([d154d0e](https://togithub.com/webpack/webpack-cli/commit/d154d0e)) #### Misc - finetune 0cjs ([bd2cd86](https://togithub.com/webpack/webpack-cli/commit/bd2cd86)) - improve cjs ([60ecc02](https://togithub.com/webpack/webpack-cli/commit/60ecc02))

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