Rename default branch to "main"

[WilliamRoyNelson]

Welcome

• [X] Yes, I've searched similar issues on GitHub and didn't find any.
• [X] I agree to follow this project's Code of Conduct

Your feature request related to a problem? Please describe

The name "main" is increasingly becoming the standard for default branch names, and it's in alignment with this project's Code of Conduct which requires the use of inclusive language.

The reason that this is important, as trivial as it may seem, is that in some corporate environments it can cause documentation or code to be flagged if it contains certain terms like "master" or "abort."

As a bonus, it saves two keystrokes! That's a 50% increase in efficiency if you look at it from a very contrived angle!

Describe the solution you'd like

GitHub has a guide on how to easily make this change: https://github.com/github/renaming

Describe alternatives you've considered

In documentation instead of using a link like: https://github.com/golangci/golangci-lint/blob/master/.golangci.reference.yml

I can instead use https://github.com/golangci/golangci-lint/blob/HEAD/.golangci.reference.yml

Additional context

No response

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