Better stdio option.

[jamestalmage]

I think the stdio array is a pretty poor UI, you have to remember the order of things. I'm constantly pulling up that piece of documentation. Instead, of the three member array, let's just give each one it's own named property:

execa('./cli.js', [], {
  stdin: someReadableStream,
  stdout: 'pipe',
  stderr: 'inherit'
});

[sindresorhus]

Hah, I was going to comment this exact thing after seeing the example in #20.

Sounds good. stdio should still be possible though, to be able to do stdio: 'inherit' without having to define all properties individually.

[jamestalmage]

Yep - I would say keep stdio fully backward compatible. Still able to use the array, just add convenience shortcuts.