NordVPN obsolete API issue fixed and demo.py improved

[ualers]

the old NordVPN API endpoint

https://nordvpn.com/api/server

has been deprecated and now returns {"status": "deprecated"}. As a result, the program was not working properly

the problem was fixed in version 0.3.1

You can now rotate ip in all US states in version 0.3.2, perfect for selenium automation

You can now rotate ip in all US states and a few more countries in version 0.3.3, perfect for selenium automation