Slicing will no longer drop the NaN rows

[xiki-tempula]

Fix #274 The Pre-processing function slicing will not drop NaN rows.

[codecov[bot]]

Codecov Report

Merging #275 (981ac53) into master (03fdc27) will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #275      +/-   ##
==========================================
- Coverage   98.69%   98.69%   -0.01%     
==========================================
  Files          26       26              
  Lines        1762     1761       -1     
  Branches      379      379              
==========================================
- Hits         1739     1738       -1     
  Misses          3        3              
  Partials       20       20              

Impacted Files	Coverage Δ
src/alchemlyb/preprocessing/subsampling.py	100.00% <ø> (ø)

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[jhenin]

Thank you @xiki-tempula and @orbeckst !