Update to urfave/cli/v3 #77
This allows for persistent flags, such that
changelog -m v0.4.0 generate and
changelog generate -m v0.4.0 are equivalent.
As an aside, I dislike this kind of flag behavior, however our current flag parsing is broken because #54 actually caused the base flags to only work if they were called via subcommand due to how the library set the pointer values.
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Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?