add newline to util/resty print method

to behave like normal lua
Well that is embarrassing. Fixed.

On 10 Sep 2014, at 21:36, Yichun Zhang <notifications@github.com> wrote:

> In util/resty:
> 
> >  
> > +        local write_to_output(...)
> Looks like a syntax error?
> 
> —
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