breaking/important changes:
* bugfix: stream didnt print newline after each item
* removed form-history backup, see 43
* lib: `browserexport.save.backup_history` can return None, if you passed `to="-"` (this tries to print the database to STDOUT)
New Features/Improvements:
* Supports lots more windows paths
* Added opera, librewolf, floorp
* better CLI error handling/help text
* can parse jsonl, jsonl.gz, json.gz files
* can write database to STDOUT/read databases from STDIN