Update DataFrames.

[pkofod]

This was just the csv read in the tests.

[codecov-io]

Codecov Report

Merging #51 (c0cc755) into master (b7a7dce) will increase coverage by 0.29%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
+ Coverage   91.22%   91.52%   +0.29%     
==========================================
  Files           5        5              
  Lines         228      236       +8     
==========================================
+ Hits          208      216       +8     
  Misses         20       20              

Impacted Files	Coverage Δ
src/IRLS.jl	100.00% <0.00%> (ø)
src/npqreg.jl	100.00% <0.00%> (ø)
src/Covariance.jl	100.00% <0.00%> (ø)
src/InteriorPoint.jl	100.00% <0.00%> (ø)
src/QuantileRegressions.jl	39.39% <0.00%> (+1.89%)	⬆️

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