Terminal feedback on token input

[NathanReb]

We suppressed the terminal input feedback when the user pastes their github token in the terminal after being prompted for it.

This is useful because the token is sensitive information, similar to a password but it is also confusing as the user has no way to know whether they actually input something or not.

An input feedback, printing * for each input character, similar to what other tools do for password would be great and much more user friendly.

This would be also benefit #385 !