Add pytest-jupyter

[blink1073]

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[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/pytest-jupyter) and found it was in an excellent condition.

[blink1073]

cc @fcollonval

[fcollonval]

Thanks @blink1073 I agree to be added as maintainer

[blink1073]

@conda-forge/staged-recipes this is good to go!