Is there support JSON-LD framing when serializing?

See: http://json-ld.org/spec/latest/json-ld-framing/

The pylod package has a method pyld_jsonld_from_rdflib_graph which does the right thing, but I would rather simplify dependencies and use rdflib

cc @hsolbrig

Note; this was already posted in:

• Support for JSON-LD Framing rdflib-jsonld#17

But as rdflib-jsonld is now merged into rdflib so it seems there should be an issue filed here, apologies if I have the protocol wrong