Ensure we aren't adding extra newlines to failure output

[synic]

Use Bunt.write instead of Bunt.puts for failure text output so we don't end up with extra newlines

Before:

After:

[rrrene]

Hi, would be helpful if you could state why we need this?

Do you want to use multiline issue messages?

[synic]

@rrrene yes, we use multiline for a bunch of them (like you see in the example). Without the fix, every line is rewritten with an extra newline due to Bunt.puts adding it's own newline.

[rrrene]

Got it. I am not necessarily against allowing multi-line issue messages, it just did not come up so far.

Out of curiosity: why would you want to print a multi-paragraph explanation as a message, when there is also the :explanations one can define for a check?