Prevent report to standard ouput, just file output

[bernardo-martinez]

Hello, I would like to request a feature of preventingmix coveralls.cobertura to output to the console, and just generate the file report.

I can work on that if you see it valuable. In my case I mainlyl work with gitlab and use the coverage file report so gitlab uses it, bu it pollutes my job output and whenever there is an test failure i need to go to the job and scroll a lot (because the console report is big) to get to the failure message.

thanks