chore: release 6.8.0

[mljs-bot]

🤖 I have created a release *beep* *boop*

6.8.0 (2021-04-23)

Features

• add multi Y options to nipals (#122) (#123) (c251328)

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This PR was generated with Release Please.

[codecov]

Codecov Report

Merging #124 (4818d97) into master (c251328) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #124   +/-   ##
=======================================
  Coverage   66.47%   66.47%           
=======================================
  Files          32       32           
  Lines        3147     3147           
  Branches      453      453           
=======================================
  Hits         2092     2092           
  Misses        975      975           
  Partials       80       80           

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