itertools breaking changes

• 0.4.19 \u2192 0.5.0behavior

  `format` to `format_with` and `format_default` to `format`

• 0.4.19 \u2192 0.5.0breaking

  `Unfold::new` to `unfold()`

• 0.4.19 \u2192 0.5.0breaking

  `RepeatCall::new` to `repeat_call()`

• 0.4.19 \u2192 0.5.0breaking

  `Zip::new` to `multizip`

• 0.4.19 \u2192 0.5.0breaking

  `PutBack::new`, `PutBackN::new` to `put_back`, `put_back_n`

• 0.4.19 \u2192 0.5.0breaking

  [Release announcement](https://bluss.github.io/rust/2016/09/26/itertools-0.5.0/)

• 0.4.19 \u2192 0.5.0breaking

  `combinations` is now `tuple_combinations`

• 0.4.19 \u2192 0.5.0breaking

  `combinations_n` to `combinations`

• 0.4.19 \u2192 0.5.0breaking

  `group_by_lazy`, `chunks_lazy` to `group_by`, `chunks`

• 0.4.19 \u2192 0.5.0breaking

  `MultiPeek::new`, `.multipeek()` to `multipeek()`

• 0.4.19 \u2192 0.5.0breaking

  `.into_rc()` to `rciter`

• 0.4.19 \u2192 0.5.0breaking

  `Partition` enum is now `Either`

• 0.4.19 \u2192 0.5.0breaking

  Module reorganization:

• 0.4.19 \u2192 0.5.0breaking

  All iterator structs are under `itertools::structs` but also reexported to the top level, for backwards compatibility

• 0.4.19 \u2192 0.5.0breaking

  `PutBack::with_value` is now a builder setter, not a constructor

• 0.4.19 \u2192 0.5.0breaking

  `ZipSlices`, use `.zip()` instead

• 0.4.19 \u2192 0.5.0breaking

  `.enumerate_from()`, `ZipTrusted`, due to being unstable

• 0.4.19 \u2192 0.5.0breaking

  `.mend_slices()`, moved to crate `odds`

• 0.4.19 \u2192 0.5.0breaking

  Stride, StrideMut, moved to crate `odds`

• 0.4.19 \u2192 0.5.0breaking

  `linspace()`, moved to crate `itertools-num`

• 0.4.19 \u2192 0.5.0breaking

  `.sort_by()`, use `.sorted_by()`

• 0.4.19 \u2192 0.5.0breaking

  `.is_empty_hint()`, use `.size_hint()`

• 0.4.19 \u2192 0.5.0removed

  All free functions are reexported at the root, `itertools::free` will be removed in the next version

• 0.3.25 \u2192 0.4.0breaking

  `.merge()`, `.unique()` and `.dedup()` now perform better due to not using function pointers

• 0.3.25 \u2192 0.4.0breaking

  Add free functions `enumerate()` and `rev()`

• 0.3.25 \u2192 0.4.0breaking

  Breaking changes:

• 0.3.25 \u2192 0.4.0breaking

  `.interleave_shortest()` is no longer guaranteed to act like fused

• 0.3.25 \u2192 0.4.0breaking

  `.merge_by()` now takes a closure that returns bool.

• 0.3.25 \u2192 0.4.0breaking

  Return type of `.dedup()` changed

• 0.3.25 \u2192 0.4.0breaking

  Return type of `.mend_slices()` changed

• 0.3.25 \u2192 0.4.0breaking

  Return type of `.unique()` changed

• 0.3.25 \u2192 0.4.0removed

  Removed deprecated macro `icompr!()`

• 0.3.25 \u2192 0.4.0removed

  Method `Merge::new` removed

• 0.3.25 \u2192 0.4.0removed

  Removed deprecated `FnMap` and method `.fn_map()`: use `.map_fn()`

• 0.3.25 \u2192 0.4.0removed

  Removed function `times()`, struct `Times`: use a range instead

• 0.3.25 \u2192 0.4.0renamed

  Return types of `.merge()` and `.merge_by()` renamed and changed

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