Luis Aleixo

With tornado version `6.2` there are some warnings on the terminal when running the tests: ``` /Users/user/.pyenv/versions/3.9.6/envs/cara/lib/python3.9/site-packages/pytest_tornasync/plugin.py:67: DeprecationWarning: clear_current is deprecated loop.clear_current() ``` My guess is that this warning is...

Warnings with backend_nbagg

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## Issue There is a warning being triggered when running `pytest` with the following instruction: ``` ipympl.backend_nbagg.new_figure_manager_given_figure(1, matplotlib.figure.Figure())) ``` The warning is the following: ``` /Users/luisaleixo/.pyenv/versions/3.9.6/envs/cara/lib/python3.9/site-packages/ipywidgets/widgets/widget.py:477: DeprecationWarning: Passing unrecognized arguments...