⚠️ Backwards-incompatible changes present.

Note on import path: I don't think that anybody will ever use both versions of library in one project at this point. So I didn't changed module path to github.com/foxcpp/go-assuan/v2. Just to keep things clean.

Incompatible API changes

• Low-level I/O code is fully reworked.

Improvements

• By default lines with more than 1000 characters are discarded with error.
• More pedantic error handling in general

New features

• client.Session.Transact now accepts objects implementing encoding.TextMarshaler as data source.

Base API is pretty much stable, so why not to tag it.