feat(homebrew): install Frum (Ruby version manager)
feat(homebrew): install Frum (Ruby version manager)

Because I need to update the wikitext gem.

Homepage:

    https://github.com/tako8ki/frum

Usage:

    eval "$(frum init)"
    frum install 3.1.0
    frum local 3.1.0

or something like that.

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