Missing dependencies

Hi,

I want to install it but when I launch it the first time it tel me that pathvalidate is missing.

The second time after use the login command with funkwhale login I have an error with keyring about a keyring backend not installed. So I check the documentation of this project and install keyrings.cryptfile because I think it's the most secure. (And there need to reuse command funkwhale login because the password is stored the first time I launch this command, logic)

I know about issue #1 but I think in waiting of developement this can be resolve easly and rapidely.