Add option to sirv-cli to not clear the console buffer

First off, awesome work on sirv. I use it basically every day and love the simplicity. So nice not to have to implement a native http server for each project to get the near native performance ❤️

My typically use case is to add sirv (via sirv-cli) for testing production builds. e.g. in a package.json NPM script task which does a production build and then serves the build assets with sirv. Works great 👍

However, when sirv starts it clears the console buffer so I lose the ability to scroll back to see the build output. I find myself either stopping the build to see the output or running sirv in a separate console… but both these approaches are less than ideal. It would be useful to have a cli flag to disable clearing the console.

Not sure what the best option name would be, maybe something like -n, --no-clear?

[maxmilton]

Works great, thank you 💯

[lukeed]

Fixed in console-clear@1.1.1. New installs will pick this up~

Thanks!