Note, not reading, but handling when to read from stdin.

Currently it's this logic: https://github.com/sindresorhus/find-versions-cli/blob/56dbd77051147819abdf845504af3b3cc1dd2935/cli.js#L30-L41

The logic is, we only try to read from stdin when there's no input and process.isTTY === false. Otherwise it won't work when used with child_process.execFile so the logic is hard to get right for many
if you only check isTTY, which i did with most of my CLIs previously, it wouldn't work with execFile, as isTTY is false there and it tries to read from stdin.

From hangouts chat:

Sindre: might consider handling reading stdin too, though not quite sure about that
maybe half of my CLIs read from stdin

Sam Verschueren: I would say "why not". But then again, it's an extra meow dependency

Sindre: extra deps doesn't matter that much since it's only used top-level by a CLI but the we can begin with the above. I want it separate anyways as some CLIs does streaming stdin reading which would require manual work anyways. so I'm thinking first a cli.stdinOrInput and maybe at a later point we can do cli.stdin() which makes use of the former.