Handle seconds in datetimes

[prakaa]

Closes #39

[codecov-commenter]

Codecov Report

Merging #40 (8c94427) into master (f89f3c5) will increase coverage by 0.45%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
+ Coverage   95.51%   95.97%   +0.45%     
==========================================
  Files           9        9              
  Lines         714      721       +7     
  Branches      144      145       +1     
==========================================
+ Hits          682      692      +10     
+ Misses         18       16       -2     
+ Partials       14       13       -1     

Flag	Coverage Δ
unittests	95.97% <100.00%> (+0.45%)	⬆️

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Impacted Files	Coverage Δ
src/nemseer/query.py	99.09% <100.00%> (+1.98%)	⬆️
src/nemseer/data_handlers.py	95.00% <0.00%> (+1.25%)	⬆️

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