Unlinking completion scripts when package is uninstalled

[ronkot]

It would be great if this package also offered unlink functionality so that one could easily do clean up on npm uninstall phase. That would look for example like:

{
  "scripts": {
    "postinstall": "install-completion bash myBashCompletion && install-completion zsh myZshCompletion",
    "postuninstall": "uninstall-completion bash myBashCompletion && uninstall-completion zsh myZshCompletion"
  }
}