Update superagent to 0.20.0 and handle new behavior.
Support "queryHashes" option (CRC pending).
Support 'crc32' in queryHash; add Crypto.Hash wrapper for 'crc' package.
Refactor testLink function for clarity/correctness.
Test with image.png to validate custom parser.
Add queryHashes test with compressed content.
Remove no-cond-assign violation, unnecessary instanceof, restore 100% coverage.
README.MD: Document "queryHashes" option.
Update to version 0.3.0.