Bump webpack-merge from 4.2.1 to 4.2.2

Bumps [webpack-merge](https://github.com/survivejs/webpack-merge) from 4.2.1 to 4.2.2.
- [Release notes](https://github.com/survivejs/webpack-merge/releases)
- [Changelog](https://github.com/survivejs/webpack-merge/blob/master/CHANGELOG.md)
- [Commits](survivejs/webpack-merge@v4.2.1...v4.2.2)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -81,7 +81,7 @@
     "vue-template-compiler": "^2.6.10",
     "webpack": "^4.39.3",
     "webpack-cli": "^3.3.7",
-    "webpack-merge": "^4.2.1",
+    "webpack-merge": "^4.2.2",
     "webpack-node-externals": "^1.7.2"
   }
 }