Slight inaccuracy in README.md regarding installing Python deps

[kaizushi]

There is a slight issue with the directions in README.md with the dependencies for Python. It tells you to do this, as a normal user...

pip install -r requirements.txt

This will actually have problems on a lot of systems as a normal user, and give this error...

ERROR: (Gentoo) Please run pip with the --user option to avoid breaking python-exec

It will not give this error if you install it using the --user parameter...

pip install --user -r requirements.txt

The README.md should be updated to reflect this

[dkasak]

Fixed, thanks!