Log Message:
py-tqdm: updated to 4.42.0

tqdm v4.42.0 stable

notebook: update disable=None behaviour
tqdm.keras: support tensorflow.keras as well as keras
add contrib
* tenumerate
* tzip <= zip
* tmap <= map
* add concurrent module
  - thread_map <= concurrent.futures.ThreadPoolExecutor.map
  - process_map <= concurrent.futures.ProcessPoolExecutor.map
* add itertools module stub
  - product
add & update tests
add & update documentation
update CI framework