Support for --user option

[AnthonyWC]

Would like to see if pip-upgrade can add support for local user install (e.g. pip --user equivalent) for non-virtualenv environment?

[simion]

I'm planning to drop package installation.
So, pip-upgrader will check everything and update your requirements file. That's it. You'll do the package installation later.

That's how most dependency upgraders work 😄