Adopt latest purl spec clarification for qualifiers #187
Description
@mprpic reported some possible inconsistencies between the latest spec and this library:
Some examples:
Out[4]: PackageURL(type='maven', namespace='org.apache.commons', name='io', version='1.3.4', qualifiers={'repository_url': 'https://example.repo.io/commons'}, subpath=None)
In [5]: p.to_string()
Out[5]: 'pkg:maven/org.apache.commons/[email protected]?repository_url=https://example.repo.io/commons'
... in this correct?