- update to 2.9.1:
* avoid buffer being unnecessarily initialized with 0s in
several functions of the ``bitarray.util`` module
* fix ``.count()`` type hint in pyi-file
* improve testing
* deprecate support for Python 2 - Python 2.7 support will be
removed in bitarray version 3.0
* ``bitarray(n)`` for integer initializer ``n`` will always
return a bitarray of length ``n`` with all items initialized
to ``0``
* allow sub-bitarray in ``.count()``, `#212
* add ``util.ones()`` ``.find()`` and ``.index()``:
add keyword argument ``right`` for rightmost index
* ``.itersearch()``: add start and stop argument, and keyword
* argument ``right``
* deprecate ``util.rindex()`` (will be removed in 3.0 release),
* use ``.index(..., right=True)`` instead
* deprecate ``util.make_endian()`` (will be removed in 3.0
release),
* use ``bitarray(..., endian=...)`` instead