Support for xeus kernel

[krey]

• I have marked all applicable categories:
  • documentation request (i.e. "X is missing from the documentation." If instead I want to ask "how to use X?" I understand StackOverflow#tqdm is more appropriate)
  • new feature request
• I have visited the source website, and in particular
  read the known issues
• I have searched through the issue tracker for duplicates
• I have mentioned version numbers, operating system and
  environment, where applicable:

  import tqdm, sys
  print(tqdm.__version__, sys.version, sys.platform)

tqdm.autonotebook doesn't detect the jupyter xeus kernel and defaults to tqdm.std

How to detect xeus: jupyter-xeus/xeus-python#470

[chengs]

as the link above said, adding sys.modules['IPython'].get_ipython().__class__.__name__ == 'XPythonShell' is a bit weak.
Better wait until xeus has a better self-identifier.