- 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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