docs(release): version 21.1.0 change log

[jack0pan]

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[codecov]

Codecov Report

Merging #687 (b34f61e) into master (94af3fc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #687   +/-   ##
=======================================
  Coverage   82.55%   82.55%           
=======================================
  Files         130      130           
  Lines        4419     4419           
  Branches     1172     1172           
=======================================
  Hits         3648     3648           
  Misses        767      767           
  Partials        4        4           

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