Upgrade to release 3.4.3:
- minor updates to documentation
C-level:
- simplify and speedup `extend_unicode01()`
- customize `resize_lite()` - avoid unused code
- use `PyTypeObject` for bitarray type object in `_util.c` to be
consistent with `_bitarray.c`
- add and improve comments to implementation of sparse bitarray
compression
- simplify `sc_count()`
Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
