Function macd 

pub fn macd(fast: usize, slow: usize, signal: usize) -> MacdConfig

Create a MACD configuration.

Example

use finance_query::backtesting::refs::*;

let m = macd(12, 26, 9);
let bullish = m.line().crosses_above_ref(m.signal_line());
let histogram_positive = m.histogram().above(0.0);