Log Message:
py-bitarray: updated to 2.2.4

2.2.4:
* use shift operations to speedup all unaligned copy operations
* expose functionality to Python level only in debug mode for testing
* add and improve tests

2.2.3:
* speedup `repeat()`
* speedup shift operations
* optimize slice assignment with negative step, e.g.: `a[::-1] = 1`
* add tests

2.2.2:
* speedup slice assignment
* speedup bitwise operations
* optimize `getbit()` and `setbit()` in `bitarray.h`
* fix TypeError messages when bitarray or int (0, 1) are expected (bool
  is a subclass of int)
* add and improve tests