Update README.rst

[rfechtner]

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[codecov]

Codecov Report

Merging #16 into master will increase coverage by 0.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   84.09%   84.32%   +0.22%     
==========================================
  Files          15       15              
  Lines         893      893              
==========================================
+ Hits          751      753       +2     
+ Misses        142      140       -2

Impacted Files	Coverage Δ
pypairs/utils.py	87.02% <0%> (+0.83%)	⬆️

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