Add DataFrames.jl to README.md

[juliohm]

Fix #87

[juliohm]

cc: @malmaud

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@3c2d117). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #100   +/-   ##
=======================================
  Coverage        ?   71.84%           
=======================================
  Files           ?        5           
  Lines           ?      277           
  Branches        ?        0           
=======================================
  Hits            ?      199           
  Misses          ?       78           
  Partials        ?        0           

Flag	Coverage Δ
unittests	71.84% <0.00%> (?)

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[juliohm]

ping @malmaud

[malmaud]

thanks!