feat: allow pretty, ndjson, wasm loggers to be started directly (#23)

One may want just one of these, allow a user to pick directly.

Closes: #23

src/ndjson.rs

@@ -5,7 +5,7 @@ use std::io::{self, StdoutLock, Write};
 use std::time;
 
 /// Start logging.
-pub(crate) fn start(level: LevelFilter) {
+pub fn start(level: LevelFilter) {
     let logger = Box::new(Logger {});
     log::set_boxed_logger(logger).expect("Could not start logging");
     log::set_max_level(level);

src/pretty.rs

@@ -11,7 +11,7 @@ const GREEN: &str = "\x1b[32m";
 const YELLOW: &str = "\x1b[33m";
 
 /// Start logging.
-pub(crate) fn start(level: LevelFilter) {
+pub fn start(level: LevelFilter) {
     let logger = Box::new(Logger {});
     log::set_boxed_logger(logger).expect("Could not start logging");
     log::set_max_level(level);

src/wasm.rs

@@ -7,7 +7,7 @@ use wasm_bindgen::prelude::*;
 use std::collections::HashMap;
 
 /// Start logging.
-pub(crate) fn start(level: LevelFilter) {
+pub fn start(level: LevelFilter) {
     let logger = Box::new(Logger {});
     log::set_boxed_logger(logger).expect("Could not start logging");
     log::set_max_level(level);