[3.3.0] - 2023-06-03 added: * added `StopwatchImpl::saturating_sub_at` and `StopwatchImpl::checked_sub_at` * added written introduction to front-page documentation * added explanation for the `Error` type's `Display` implementation to its documentation changed: * rewrote `Stopwatch` `PartialEq` impl without (unreachable) panicking branches removed: * removed example from front-page documentation