Justin Black 798ad2f87d
[python-experimental] simplifies json serialization (#7061)
* Requires python >= 3.5, adds type hints to call_api method

* Adds type hints to files_parameters and __call_api

* Adds and uses a new json encoded to prepare data before it is sent

* Removes nose name from gitlab testing invocations

* Also updates travis to py>=3.5

* Collapses encoder back into sanitize_for_serialization
2020-07-28 08:16:19 -07:00
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