hotfix for sb.list_products_targets

[PastorJordi]

Thanks for creating and maintaining this repository. It has been really useful for me.

Yesterday I spent some minutes delving deep into the code and trying to get a successful request on sb/targets/list.
To make you aware of it and perhaps save someone else time, I am making a PR with a bypass.
I am pretty newbie to python and APIs so perhaps it is not an actual issue / it can be solved in a more graceful way.

Cheers,

Jordi

[denisneuf]

Hola Jordi,
Thanks to pointing the problem, I tested the endopoint and get:
ad_api.base.exceptions.AdvertisingApiException: {'status_code': 415, 'message': 'Cannot consume content type'}
So even the Amazon docs mention a specific content-type as you mention it won't work unless the content type is left by default as a regular application/json.
Kindest Regards.
Daniel.