Can't resolve dependency

* **Version**: 21.2

* **Target**: mac

Hi. we've been using this project lately and must praise you for the effort you built into it.

I do have an issue with some dependency. At first, I thought it might have been the specific dependency, but the warnings started to show up for more dependencies lately, so this might be a problem with my config.

Whenever I build or run the dev-server, I get warnings like this:
```
WARNING in ./node_modules/websocket/lib/BufferUtil.js
Module not found: Error: Can't resolve '../build/default/bufferutil' in '/electron/node_modules/websocket/lib'
```

Here are my `devDependencies`
```
{
"@types/websocket": "^0.0.40",
"concurrently": "^4.1.2",
"electron": "6.0.3",
"electron-builder": "^21.2.0",
"electron-is-dev": "^1.1.0",
"electron-reload": "^1.5.0",
"electron-webpack": "^2.7.4",
"electron-webpack-ts": "^3.2.0",
"electron-window-state": "^5.0.3",
"node-pre-gyp": "^0.13.0",
"typescript": "^3.5.3",
"wait-on": "^3.3.0",
"webpack": "~4.39.2",
"websocket": "^1.0.29"
}
```
Any hint of what might be wrong here would be greatly appreciated.