Add option to hide compilation duration

[jimblue]

What problem does this feature solve?

As Webpackbar, some other Webpack plugins also show compilation time. Obviously this information is not needed twice, so it could be nice to be able hide hide it.

Thanks

_{This feature request is available on Nuxt community (#c32)}

[ImanMh]

Same here. I'd like webpackbar to cleanup after it finishes the job. Currently I'm using a watcher and it keeps plotting my console which is really annoying.