5.3.4 (with updated meta and tests)

[bollwyvl]

Checklist

• Used a fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

alternative to #32.

This:

• adds some deps from upstream
• adds tests
• updates some metadata
• sorts things
• adds myself to maintainer list

[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 (recipe) and found it was in an excellent condition.

[bollwyvl]

@conda-forge-admin please rerender

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-webservice.

I tried to re-render for you, but it looks like there was nothing to do.

[bollwyvl]

All right: with the dirty trick of skipping the win/py38 tests entirely, this looks good to go!

[bollwyvl]

Presumably when ipykernel comes out clean on that combination, we can revisit:
ipython/ipykernel#456

[mbargull]

blocks conda-forge/spyder-kernels-feedstock#42