gocredits creates CREDITS file from LICENSE files of dependencies

gocredits . > CREDITS

When distributing built executable in Go, we need to include LICENSE of the dependent libraries into the package, so gocredits bundle them together as a CREDITS file.

To use gocredits, we should use go modules for dependency management.

% brew install Songmu/tap/gocredits

% go install github.com/Songmu/gocredits/cmd/gocredits@latest

% aqua g -i Songmu/gocredits

Built binaries are available on GitHub Releases. https://github.com/Songmu/gocredits/releases

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