ipytest.magic seems deprecated

[Peer202]

When doing the "testing with pytest part 1" notebook, there is an error, saying that a attribute called ipytest.magic doesnt exist. When having a look at the page for ipytest, i noticed that the usage seems to have changed. https://pypi.org/project/ipytest/
Did i understand that correctly? I installed ipytest for the first time today.

[jerry-git]

Indeed! Thanks for the report.

Fixed in #35