Fixes https://travis-ci.org/robofab-developers/fontParts/jobs/402178235#L499 Instead of passing a unicode string to lxml.etree.fromstring, which must not have an XML declaration containing an explicit encoding, we now pass a UTF-8 bytes string. The latter may or may not have the xml declaration. If it doesn't, UTF-8 is implied by lxml parser (libxml2 defaults to UTF-8 internally).
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