v0.5.0

• Breaking: The Sortable trait now returns std::io::Result on both encode
  and decode methods, exposing underlying errors.
• Breaking: The SortedIterator iterator now returns std::io::Result<T>
  instead of T directly, allowing propagation of underlying errors.
• Breaking change: The comparator methods or key extractor now require being
  Clone. This change should not affect most users, as closures are Clone if
  they don't capture any variables.
• Added a new "pushed" iterator, which allows pushing new elements instead of
  consuming them through an iterator. This is particularly useful when the data is
  not readily available as an iterator.
• Methods accepting iterators now accept IntoIterator for flexibility.

v0.4.2

[0.4.2] - 2021-02-04

Added

• Added sort_by and sort_by_key (by @NieDzejkob #10)

v0.4.0

Added

• Support for parallel sorting of the in-memory buffer (see ExternalSorter::with_parallel_sort).
  This feature is not always beneficial if the in-memory buffer is not big enough for parallelism to
  have an impact, so benchmark your workload.

Changed

• Breaking: cleaner Sortable trait (see commit)
  The trait also requires the implementer to be Send to support the new parallel sorting feature.

• Breaking: replaced setter styles methods with builder style methods (see PR #9)

  • set_max_size is now with_segment_size
  • set_sort_dir is now with_sort_dir