v0.4.0

Changed

• trim_mut, trim_start_mut, and trim_end_mut have been generalized to accept any of the following:
  • A single T;
  • An array or slice of T;
  • A &BTreeSet<T>;
  • A custom callback with signature Fn(T) -> bool;
    • Callbacks now require Copy;
• Bump MSRV to 1.81