Prepare release v0.15.0

[pellared]

Added

• Add CHANGELOG.md based on Keep a Changelog. (#131)
• Add CODE_OF_CONDUCT.md based on Contributor Covenant. (#133)

Changed

• Refine the triggers for the build GitHub workflow. (#130)
  • Automatic trigger for the main branch.
  • Automatic trigger for pull requests targeting the main branch.
  • Manual trigger via workflow_dispatch (blog post).
• Lock the runners' version the in build and release GitHub workflows. (#130)
• Configure golint linter with min-confidence: 0.8 to avoid false positive "should have a package comment". (#132)
• Configure gocyclo linter with min-complexity: 15 with is a recommeded value by Go Report Card. (#132)
• Update GoReleaser to 0.164.0. (#129)

[codecov]

Codecov Report

Merging #134 (bd54890) into main (722a3dc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #134   +/-   ##
=======================================
  Coverage   50.00%   50.00%           
=======================================
  Files           1        1           
  Lines           2        2           
=======================================
  Hits            1        1           
  Misses          1        1           

Flag	Coverage Δ
Linux	50.00% <ø> (ø)
Windows	50.00% <ø> (ø)
macOS	50.00% <ø> (ø)

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