fix issue with mypy

[keiyamamo]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.48%. Comparing base (7ec7bec) to head (882ce9a).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/vasp/automatedPostprocessing/log_plotter.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #205   +/-   ##
=======================================
  Coverage   82.48%   82.48%           
=======================================
  Files          32       32           
  Lines        3956     3957    +1     
=======================================
+ Hits         3263     3264    +1     
  Misses        693      693           

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