SnakeCaseCodingKey And CamelCase handling?

[umairsuraj]

let json = """ {"user_id": "abc", "name": "tattn"} """.data(using: .utf8)!

For Upper Camel Case:

let json = """
{"UserId": "abc", "Name": "tattn"}
""".data(using: .utf8)!

[NachoSoto]

See also #51.