Macro csv_stop

macro_rules! csv_stop {
    ($writer: ident) => { ... };
}

Flushes the writer and writes to file.

Usage:

use make_csv::{csv_start, csv_entry, csv_stop};

let mut wtr = csv_start!("out.csv");
csv_entry!(wtr <- "header_0", "header_1");
csv_entry!(wtr <- 0.0, 1.0);
csv_stop!(wtr);