Make sure output is utf-8 encoded

[pieterdeschepper]

Otherwise, you cannot send stdout to any other process or file without running into the error
UnicodeEncodeError: 'ascii' codec can't encode characters in position 23-25: ordinal not in range(128)

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[pieterdeschepper]

@googlebot I signed it!

[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.