add new data sets

[rafaelslins]

Data sets: fibonacci.500 gm.payments invoices.paid journal.entry madoff.returns purchasing.cards.2010 streamflow

[codecov-io]

Codecov Report

Merging #19 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #19   +/-   ##
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  Coverage   97.49%   97.49%           
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  Files           3        3           
  Lines         359      359           
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  Hits          350      350           
  Misses          9        9

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[rafaelslins]

Carlos,

• In fact, the "invoices paid" date is a duplicate of the "Corporate payment" data.
• I will include the page numbers in the data documentation.