ditto make -w should watch symlinked packages

[jmackie]

Should be fairly easy to do, logic is here:

ditto/crates/ditto-cli/src/make.rs

Lines 108 to 120 in a1d9631

	// watch `./src` (should really be present)
	watcher
	.watch(&config.src_dir, notify::RecursiveMode::Recursive)
	.into_diagnostic()?;
	// watch `./tests` (if it's present)
	if config.test_dir.exists() {
	watcher
	.watch(&config.test_dir, notify::RecursiveMode::Recursive)
	.into_diagnostic()?;
	}
	// TODO: allow watching more files via config or a flag?