body params are reset when called again

[pavivin]

steps to reproduce

1. params dumped to json-string
2. if status == 401 __send_request called again
3. if params not dict and not list they assigned to empty dict

[pavivin]

sendpulse-rest-api-python/pysendpulse/pysendpulse.py

Line 160 in e66efb9

return self.__send_request(path, method, params)

return self.__send_request(path, method, json.loads(params))