Require importlib-metadata

[talonchandler]

#149 was introduced by #127, and this fixes the issue.

This error snuck by my review because I assumed importlib_metadata was a builtin. My bad. I'm surprised this snuck by our tests...I will look closer tomorrow morning and update the tests to catch.

I tested a successful install by hand. Ready to merge from my perspective.

[deprecated-napari-hub-preview-bot]

Preview page for your plugin is ready here:
https://preview.napari-hub.org/mehta-lab/recOrder/150
Updated: 2022-08-23T02:54:25.405956

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@845f304). Click here to learn what that means.
The diff coverage is n/a.

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[talonchandler]

I've added a simple smoke test to prevent this from happening again. Tests failed on the branch from main and now pass after merging into this branch.

Ready for review + merge.