Astropy conversion via plum

[nstarman]

See #21 for necessary followup to address this bug.

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 6 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (main@ae12528). Click here to learn what that means.

Files	Patch %	Lines
src/vector/_d3/compat.py	85.36%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #22   +/-   ##
=======================================
  Coverage        ?   97.83%           
=======================================
  Files           ?       20           
  Lines           ?      555           
  Branches        ?        0           
=======================================
  Hits            ?      543           
  Misses          ?       12           
  Partials        ?        0           

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