scylla 0.3.0

#[tokio::test]
#[ignore]
async fn authenticate_superuser() {
    let uri = std::env::var("SCYLLA_URI").unwrap_or_else(|_| "127.0.0.1:9042".to_string());

    println!("Connecting to {} with cassandra superuser ...", uri);

    let session = crate::SessionBuilder::new()
        .known_node(uri)
        .user("cassandra", "cassandra")
        .build()
        .await
        .unwrap();

    session.query("CREATE KEYSPACE IF NOT EXISTS ks WITH REPLICATION = {'class' : 'SimpleStrategy', 'replication_factor' : 1}", &[]).await.unwrap();
    session
        .query("DROP TABLE IF EXISTS ks.t;", &[])
        .await
        .unwrap();

    println!("Ok.");
}