Bump webpack-bundle-analyzer from 2.13.1 to 3.8.0

Bumps [webpack-bundle-analyzer](https://github.com/webpack-contrib/webpack-bundle-analyzer) from 2.13.1 to 3.8.0.
- [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/compare/v2.13.1...v3.8.0)
Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -55,7 +55,7 @@
     "vue-style-loader": "^2.0.0",
     "vue-template-compiler": "^2.4.2",
     "webpack": "^2.2.1",
-    "webpack-bundle-analyzer": "^2.2.1",
+    "webpack-bundle-analyzer": "^3.8.0",
     "webpack-dev-middleware": "^1.10.0",
     "webpack-hot-middleware": "^2.16.1",
     "webpack-merge": "^2.6.1"