RSA1024 isn't supported anymore

On the latest version of tor, this library errors on:
Write line: ADD_ONION NEW:RSA1024 Port=80,127.0.0.1:37019 Read line: 513 Invalid key type
RSA1024 isn't supported anymore as of tor 0.4.6.7, the only options are BEST or ED25519-V3

[cretz]

👍 I don't make updates to this library a lot anymore, but given a pull request I'd happily accept it. Though some people to use this with older versions of Tor (though of course they should be upgrading).