Callback with single argument not error first

[lambduli]

EDIT: Sorry for nonsense request - one of my weaker moments - you can close it.

Hello,
If function passed into pify has only one argument it's usually something like data, result, or so. This callback has only option for success, thus must be used with additional options - errorFirst: false.

Would it be possible to consider change of default behavior, since from #31 we have support for not error first callbacks?

When callback.length is 1, function takes single argument and it would be considered as errorFirst: false by default.
It would be less verbose.
If it would or wouldn't be less clear is on your consideration.

Thank you.