[0.1.0] - 2022-08-07 * added Stopwatch * added Stopwatch::new * added Stopwatch::start * added Stopwatch::stop * added Stopwatch::toggle * added Stopwatch::reset * added Stopwatch::set * added Stopwatch::elapsed * added Stopwatch::is_running * added Stopwatch::is_stopped * added Add, Sub, AddAssign, and SubAssign impls for Stopwatch