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- Update to 1.5.3:
  * add optional index parameter to `.index()` to invert single bit
  * fix `sys.getsizeof(bitarray)` by adding `.__sizeof__()`, see issue #100

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- Update to 1.5.2: 
  * add PyType_Ready usage, issue #66
  * speedup search() for bitarrays with length 1 in sparse bitarrays,
    see issue #67
  * add tests
  * support signed integers in `util.ba2int()` and `util.int2ba()`,
    see issue #85
  * deprecate `.length()` in favor of `len()`
  * Use `Py_ssize_t` for bitarray index.  This means that on 32bit
    systems, the maximun number of elements in a bitarray is 2 GBits.
    We used to have a special 64bit index type for all architectures, but
    this prevented us from using Python's sequence, mapping and number
    methods, and made those method lookups slow.
  * speedup slice operations when step size = 1 (if alignment allows
    copying whole bytes)
  * Require equal endianness for operations: `&`, `|`, `^`, `&=`, `|=`, `^=`.
    This should have always been the case but was overlooked in the past.
  * raise TypeError when tring to create bitarray from boolean
  * This will be last release to still support Python 2.6 (which was retired
    in 2013).  We do NOT plan to stop support for Python 2.7 anytime soon.

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- Update to 1.4.2:
  * C-level:
      - simplify pack/unpack code
      - fix memory leak in `~` operation (bitarray_cpinvert)
  * add official Python 3.9 support
  * improve many docstrings
  * add DeprecationWarning for `bitdiff()`
  * add DeprecationWarning when trying to extend bitarrays
    from bytes on Python 3 (`bitarrays(b'011')` and `.extend(b'110')`)
  * C-level:
      - rewrote `.fromfile()` and `.tofile()` implementation,
        such that now the same code is used for Python 2 and 3.
        The new implementation is more memoery efficient on
        Python 3.
      - use memcmp() in richcompare to shortcut EQ/NE, when
        comparing two very large bitarrays for equality the
        speedup can easily be 100x
      - simplify how unpacking is handled
  * add more tests
  * add `.clear()` method (Python 3.3 added this method to lists)
  * avoid overallocation when bitarray objects are initially created
  * raise BufferError when resizing bitarrays which is exporting buffers
  * add example to study the resize() function
  * improve some error messages
  * raise `NotImplementedError` with (useful message) when trying to call
    the `.fromstring()` or `.tostring()` methods, which have been removed
    in the last release

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