Log Message:
py-more-itertools: updated to 10.3.0

10.3.0
------

* New functions
    * :func:`powerset_of_sets`, :func:`dft`, and :func:`idft` (thanks to rhettinger)
    * :func:`join_mappings` (thanks to NeilGirdhar and rhettinger)
    * :func:`doublestarmap` (thanks to Skeen, monk-time, DamianB-BitFlipper, and \ 
ergoithz)
    * :func:`unique` (thanks to rhettinger)

* Changes to existing functions
    * :func:`collapse`, :func:`chunked_even`, :func:`ichunked`, :func:`padded`, \ 
and :func:`windowed` were optimized and improved (thanks to james-wasson)
    * :func:`totient` was optimized (thanks to rhettinger)
    * :func:`roundrobin` was updated and improved (thanks to rhettinger)
    * :func:`all_equal` now accepts a *key* parameter.
    * The docs for :func:`value_chain` were improved (thanks to bjrtx)
    * The type annotations for :class:`countable` were improved (thanks to aidanholm)

* Other changes
    * Unit tests were improved (thanks to haukex)
    * Some documentation issues were fixed (thanks to bjrtx and DimitriPapadopoulos)