Add appendObjectName

[eliedrian]

Currently, the only way I can find to mutate an object with a collection is to update the collection and insert my new member of the collection along with the existing members.

Is it possible to have a mutation to append a list?

[nirinchev]

This is currently tracked in #28. It's not currently possible, but we're exploring options to enable that. In theory, it shouldn't be too hard to do but hasn't been prioritized yet.