is not JSON serializable error. According to API documentation post request needs file object. That means "json.dumps" is not needed [here](https://github.com/retailcrm/api-client-python/blob/27ff0849eca746be250d35e21b304f5fb948062e/retailcrm/versions/v5.py#L745). I've made [fork](https://github.com/Pluser761/api-client-python), to fix that ([here it is](https://github.com/Pluser761/api-client-python/blob/95bf0b143a9933ef17d0cb2f18630111c310500d/retailcrm/versions/v5.py#L745)), but could not make pull request. Merge that please.
is not JSON serializable error.
According to API documentation post request needs file object. That means "json.dumps" is not needed here.
I've made fork, to fix that (here it is), but could not make pull request.
Merge that please.