fix bug separating multiple values when printing

[bo-tato]

slynk-pprint-values forgets to pass the stream to terpri when it prints a newline between values, so when you eval in emacs for example (parse-integer "243") it shows as 2433, with this fix it will print correctly:

243
3

[joaotavora]

so when you eval in emacs for example (parse-integer "243")

What method of evaluation are you using? REPL? C-x C-e? I can't reproduce this.

[bo-tato]

ah true, I got it using the eval in overlay code from #567
which is running (sly-eval `(slynk:pprint-eval ,(sly-sexp-at-point)))
that overlay code has I think a few edge cases where it doesn't display things right, but unless I'm missing something this one isn't the fault of my sly-eval-sexp-overlay. It seems C-x C-e doesn't call slynk-pprint-values. Without the patch slynk-pprint-values returns the string "2433", after the patch it returns the string:

243
3

with the newline as I think is intended