Add information about pnputil to README to help fix binding issues

[chunky125]

I had some issues with binding and unbinding with usbip, meaning that I ended up with usbip-stub driver overriding some devices which I did not want it to.

I used pnputil -d oemXXX.inf to fix this, and I think that it is worth adding this to your README to help people who might have the same issue in future, especially while development is ongoing.

[cezanne]

@chunky125 : Great! Could you submit a PR about your changed README ?

[cezanne]

@chunky125 : I'm going to close this issue. Please reopen if you need.

[amanvats88]

For all those who stumbled here looking for a quick fix to the problem of not being able to unbind USB device, refer to #271.