support SENTRY_DSN for OPDS server #49
Description
Seperate plain http no longer maintained, now builtin to opds server.
Also see:
- https://github.com/bugsink/bugsink/ which claims to be sentry compatible.
- https://github.com/bbangert/zilch alternative client lib
- https://github.com/clach04/google_sheets_scripts/tree/master/log_json_post