Changelog:
===========
* add data descriptions: '.nbytes', '.padbits', '.readonly'
* allow optional 'endian' argument to be 'None' when creating bitarrays
* fix type annotation for 'canonical_decode()', #178
* frozenbitarray's padbits are now guaranteed to be zero
* add tests
Signed-off-by: Zheng Ruoqin <zhengrq.fnst@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
