Provide custom headers on methods

[leplatrem]

I want to provide custom JSON-merge headers on a call to client.patch_record() but apparently I can't provide them.

It would better to accept custom headers like on the JS client, that would be merged with the ones the session (like authorization)

[glasserc]

Having gone through the JS client recently, I'm really nervous about the proliferation of options like headers, retry, safe etc. on every single method. I'd much rather just add something for this one use case, like client.patch_record(JSONMerge(a="new a field")) and client.patch_record(JSONPatch(operations)).

[gabisurita]

What about a mergeattribute instead of passing raw headers?

[leplatrem]

yeah or something like client.patch_record(jsonmerge=payload) or client.patch_record(payload, jsonmerge=True).

If you don't agree, then maybe I would just prefer client.jsonmerge_record() and client.jsonpatch_record().

client.patch_record(JSONMerge(a="new a field"))

How would that one work?

[glasserc]

Fixed in #158.