PAP flag missing when creating a case from a retrieved Case object

[PierreNei]

Bug

Work Environment

Question	Answer
OS version (server)	Ubuntu 18.04 LTS
OS version (client)	Ubuntu 18.04 LTS
TheHive4py version / git hash	1.6.0

Problem Description

After retrieving a case from a Hive instance with find_cases(), if you pass the case to create a new one the PAP flag is ignored and the new case always shows AMBER (2)

Steps to Reproduce

1. Create a case in the Hive with PAP flag set to something else than AMBER
2. Retrive this case from API and create a new one from the same object:

if response.status_code == 200:
  if len(response.json()) > 0:
    dest_api.create_case(Case(**response.json()[0]))

3. Newly created case always shows a PAP flag set to Amber