Bump webpack-bundle-analyzer from 2.13.1 to 3.9.0

Bumps [webpack-bundle-analyzer](https://github.com/webpack-contrib/webpack-bundle-analyzer) from 2.13.1 to 3.9.0.
- [Release notes](https://github.com/webpack-contrib/webpack-bundle-analyzer/releases)
- [Changelog](https://github.com/webpack-contrib/webpack-bundle-analyzer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/webpack-bundle-analyzer/commits)

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

Author: dependabot[bot]

package.json

@@ -34,7 +34,7 @@
     "mochawesome": "^3.0.3",
     "opn": "^5.3.0",
     "webpack": "^3.12.0",
-    "webpack-bundle-analyzer": "^2.12.0",
+    "webpack-bundle-analyzer": "^3.9.0",
     "webpack-sources": "^1.2.0"
   },
   "scripts": {