Print info message when reading from stdin. - #5138
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When running `fly tokens attenuate`, we read from `stdin` but that's not
immediately obvious and Ctrl+C won't work. Ctrl+D does, but users may
not think of that because, again, it's not obvious that `fly` is reading
from `stdin`. Let's print an info message to make this more clear:
$ fly tokens attenuate
Reading caveats from stdin; press Ctrl+D to exit.
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When running
fly tokens attenuate, we read fromstdinbut that's not immediately obvious and Ctrl+C won't work. Ctrl+D does, but users may not think of that because, again, it's not obvious thatflyis reading fromstdin. Let's print an info message to make this more clear: