address CRAN comments

[IndrajeetPatil]

No description provided.

[codecov-io]

Codecov Report

Merging #163 (728813b) into master (336151b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #163   +/-   ##
=======================================
  Coverage   89.49%   89.49%           
=======================================
  Files          38       38           
  Lines        1323     1323           
=======================================
  Hits         1184     1184           
  Misses        139      139           

Impacted Files	Coverage Δ
R/cor_test.R	98.03% <100.00%> (ø)
R/correlation.R	94.36% <100.00%> (ø)

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