py-packageurl: updated to 0.9.8.1

0.9.8.1
- Fix generic sourceforge PackageURL generation

0.9.8
- Do not create a generic PackageURL for URLs without a path in url2purl
- Use project name as the Package name when creating generic sourceforge PackageURLs
- Update PyPI route pattern in url2purl to handle different file name formats
- Create generic PackageURL for code.google.com archive URLs
- Capture more download types for bitbucket URLs

(adam)