Remove legacy mode from write attributes

[faridyagubbayli]

Closes #253

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (20890d2) 66.51% compared to head (6721665) 66.45%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
- Coverage   66.51%   66.45%   -0.07%     
==========================================
  Files          48       48              
  Lines        6998     6982      -16     
  Branches     1583     1579       -4     
==========================================
- Hits         4655     4640      -15     
  Misses       1728     1728              
+ Partials      615      614       -1     

Flag	Coverage Δ
3.10	66.61% <100.00%> (-0.07%)	⬇️
3.11	66.61% <100.00%> (-0.07%)	⬇️
3.8	66.42% <100.00%> (-0.07%)	⬇️
3.9	66.42% <100.00%> (-0.07%)	⬇️
ubuntu-latest	66.39% <100.00%> (-0.07%)	⬇️
windows-latest	66.39% <100.00%> (-0.07%)	⬇️

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[waltsims]

Nice. Looks good to me!

As I mentioned in #291 it would be good to document how to create the .json files from potential new kWave releases. Perhaps we can add those instructions there.

[waltsims]

@faridyagubbayli please look into this and re-open a PR.