This is fdupes 2.2.1. If you're an end-user then you probably want the file named fdupes-2.2.1.tar.gz. The other archives are created automatically by GitHub and are intended for developers.
Changes from 2.2.0 to 2.2.1:
- Fix bug in code meant to skip over the current log file when --log option is given.
- Updates to copyright notices in source code.