Using pct_change to implement the to_simple_returns() function for se…

[myrmarachne]

…ries and dataframes

[codecov-commenter]

Codecov Report

Merging #132 (b32aed2) into master (216e6d4) will increase coverage by 0.10%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
+ Coverage   76.70%   76.81%   +0.10%     
==========================================
  Files         227      227              
  Lines        9068     9071       +3     
==========================================
+ Hits         6956     6968      +12     
+ Misses       2112     2103       -9     

Files	Coverage Δ
qf_lib/containers/dataframe/prices_dataframe.py	100.00% <100.00%> (ø)
...b/containers/dataframe/simple_returns_dataframe.py	100.00% <100.00%> (ø)
qf_lib/containers/series/prices_series.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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