Bump webpack-cli from 3.3.8 to 3.3.9

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 3.3.8 to 3.3.9.
- [Release notes](https://github.com/webpack/webpack-cli/releases)
- [Changelog](https://github.com/webpack/webpack-cli/blob/v3.3.9/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-cli/compare/v3.3.8...v3.3.9)

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

package-lock.json

@@ -18124,9 +18124,9 @@
 			}
 		},
 		"webpack-cli": {
-			"version": "3.3.8",
-			"resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.3.8.tgz",
-			"integrity": "sha512-RANYSXwikSWINjHMd/mtesblNSpjpDLoYTBtP99n1RhXqVI/wxN40Auqy42I7y4xrbmRBoA5Zy5E0JSBD5XRhw==",
+			"version": "3.3.9",
+			"resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.3.9.tgz",
+			"integrity": "sha512-xwnSxWl8nZtBl/AFJCOn9pG7s5CYUYdZxmmukv+fAHLcBIHM36dImfpQg3WfShZXeArkWlf6QRw24Klcsv8a5A==",
 			"dev": true,
 			"requires": {
 				"chalk": "2.4.2",