The oldreader support (theoldreader.com)

[gochev]

Is your feature request related to a problem? Please describe.
It is great we have the sync options but for us that use theoldreader we cant switch to raven for now, it will be good to be added.

Describe the solution you'd like
Add support for theoldreader.com

Describe alternatives you've considered
No alternatives

Additional context
to be added here I guess