fix df export

[PharmCat]

No description provided.

[codecov]

Codecov Report

Patch coverage: 80.95% and project coverage change: +0.45% 🎉

Comparison is base (71a1c60) 90.79% compared to head (bc5f87e) 91.25%.
Report is 20 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
+ Coverage   90.79%   91.25%   +0.45%     
==========================================
  Files           2        3       +1     
  Lines         239      263      +24     
==========================================
+ Hits          217      240      +23     
- Misses         22       23       +1     

Files Changed	Coverage Δ
src/MetidaStats.jl	100.00% <ø> (ø)
src/types.jl	100.00% <ø> (ø)
src/descriptive.jl	91.15% <80.95%> (+0.43%)	⬆️

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