Context.RunOutput and Context.BashOutput don't return 2 values

[sytabaresa]

Hello, In the README you use two values of return for RunOutput method:

output, err := c.RunOutput("whoami")

and the same for c.BashOutput

but in the package only returns a string: https://godoc.org/github.com/go-godo/godo#Context.RunOutput

Which is wrong?