Encoding information missing on OWL

[matthiaskoenig]

The XML header of the OWL file should be

<?xml version="1.0" encoding="UTF-8"?>

instead of

<?xml version="1.0">

This allows more robust parsing, e.g., via the pronto library

/home/mkoenig/git/pymetadata/src/pymetadata/resources/ontologies/sbo.owl.gz
/home/mkoenig/git/pymetadata/src/pymetadata/ontologies/ontology.py:196: UnicodeWarning: unsound encoding, assuming utf-8 (75% confidence)
  self.__class__._ontology = pronto.Ontology(ontology_file.filename)
``