8.13.0
------
* New functions
* The :func:`subslices` recipe from the `itertools` docs was added (thanks to rhettinger)
* Changes to existing functions
* The :func:`ichunked` function is now more efficient (thanks to hjtran0 and seanmacavaney)
* The :func:`difference` function is now more efficient (thanks to Masynchin)
* The :func:`grouper` recipe now has more features, mirroring the one in the `itertools` docs (thanks to rhettinger)
* Other changes
* Some documentation issues were fixed (thanks to medvied and Freed-Wu)
* The `more_itertools` package is now built with `flit` (thanks to mgorny)
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