Update version to 7.20.0

[kkdai]

• Update actions/setup-go action to v4. #342

• Includes @All in the mention property of the webhooks. #343(Cheng-Lung Sung)

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (32bbba1) 78.77% compared to head (a46e7eb) 78.77%.

❗ Current head a46e7eb differs from pull request most recent head 009391e. Consider uploading reports for the commit 009391e to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #344   +/-   ##
=======================================
  Coverage   78.77%   78.77%           
=======================================
  Files          39       39           
  Lines        3600     3600           
=======================================
  Hits         2836     2836           
  Misses        581      581           
  Partials      183      183           

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