No license notice when getting official binaries

[xiaq]

What happened, and what did you expect to happen?

A user who downloads Elvish's official binaries from https://elv.sh/get/ doesn't see any license notice during the process, but they should.

This can be fixed by adding a license notice to either the website or the binary itself (such as via a new -license flag that just prints the license notice). The latter benefits all distributors of the Elvish binary and seems preferable.

Output of "elvish -version"

irrelevant

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