updated to work with openmc_tally_unit_converter 0.5.2

[shimwell]

No description provided.

[codecov]

Codecov Report

Merging #22 (71c4688) into main (b49d6db) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main     #22   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files          3       3           
  Lines        126     126           
=====================================
  Misses       126     126           

Impacted Files	Coverage Δ
regular_mesh_plotter/core.py	0.00% <ø> (ø)

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