README: Adding v0.9.4 as "compatible" in NB note (#83)
README: Adding v0.9.4 as "compatible" in NB note (#83)

- writing it like "v0.9.2" - those are the Git tags used
jesjos/active_record_upsert,jesjos/active_record_upsert,jesjos/active_record_upsert,jesjos/active_record_upsert