customVector

Usage:

```rust use simple_accumulator::SimpleAccumulator;

fn main() { let k = [1, 2, 3, 4];

// Set field `accumulate` to `false` to not update the field values when
// changed, you will need to run `calculate_all` to get updated values.
let mut x = SimpleAccumulator::new(&k, true);

println!("{:#?}", x);
x.push(5);

println!("{:#?}", x);

x.pop();
println!("{:#?}", x);

x.remove(2);
println!("{:#?}", x);

}

```

Output:

shell SimpleAccumulator { vec: [ 1.0, 2.0, 3.0, 4.0, ], mean: 2.5, population_variance: 1.25, standard_deviation: 1.118033988749895, min: 1.0, max: 4.0, median: 2.5, len: 4, } SimpleAccumulator { vec: [ 1.0, 2.0, 3.0, 4.0, 5.0, ], mean: 3.0, population_variance: 1.8, standard_deviation: 1.3416407864998738, min: 1.0, max: 5.0, median: 3.0, len: 5, } SimpleAccumulator { vec: [ 1.0, 2.0, 3.0, 4.0, ], mean: 2.5, population_variance: 1.25, standard_deviation: 1.118033988749895, min: 1.0, max: 4.0, median: 2.5, len: 4, } SimpleAccumulator { vec: [ 1.0, 2.0, 4.0, ], mean: 2.3333333333333335, population_variance: 1.5833333333333333, standard_deviation: 1.2583057392117916, min: 1.0, max: 4.0, median: 2.416666666666667, len: 3, }