feat: log in with soulseek-rs's own client major version (176) (#13)

The Login message hardcoded SoulseekQt's major version 157, so the
server could not tell soulseek-rs apart from the official client. The
protocol document now reserves a unique major version per project, so
claim 176 and send it via a new ClientVersion on ClientSettings.

Clients and bots built on the library keep major 176 and pick their own
minor version (default 1); the reference CLI/TUI logs in with minor 100.

Refs #12

soulseek-rs-lib/src/client/connection.rs

@@ -108,6 +108,7 @@ impl Client {
             let _ = handle.send(ServerMessage::Login {
                 username: self.username.clone(),
                 password: self.password.clone(),
+                version: self.version,
                 response: tx,
             });