Bump webpack-cli from 2.0.9 to 2.0.11

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 2.0.9 to 2.0.11.
- [Release notes](https://github.com/webpack/webpack-cli/releases)
- [Changelog](https://github.com/webpack/webpack-cli/blob/master/CHANGELOG.md)
- [Commits](webpack/webpack-cli@v2.0.9...v2.0.11)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support