Closes #126 - Update check for filename to allow underscore

[cpiraux]

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Changes Description

Move the check for the file name to strict_check to allow underscores in the filename.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (601209f) 100.00% compared to head (2e592e0) 100.00%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #208   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines          582       582           
=========================================
  Hits           582       582           

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[bms63]

This is newsworth! Can you make a short blurb in the NEws section about this relaxation of our checks

[bms63]

Let's go!! Thanks for doing this one!!