Renamed 'r' with 'pointbiserialr' in convert_effsize

[raphaelvallat]

Closes #302

Tasks

• Update notebook
• Update changelog

[codecov]

Codecov Report

Base: 98.59% // Head: 98.59% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (7af2fb0) compared to base (cdb5831).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #325   +/-   ##
=======================================
  Coverage   98.59%   98.59%           
=======================================
  Files          19       19           
  Lines        3347     3349    +2     
  Branches      541      542    +1     
=======================================
+ Hits         3300     3302    +2     
  Misses         25       25           
  Partials       22       22           

Impacted Files	Coverage Δ
pingouin/utils.py	92.45% <ø> (ø)
pingouin/effsize.py	100.00% <100.00%> (ø)

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