Attributes with 'v2x' are serialized as 'V2x', but should be serialized as 'V2X'.

[OrangeTux]

ocpp/ocpp/v201/extensions/v2x/datatypes.py

Lines 85 to 86 in db25fbd

	ev_min_v2x_energy_request: Optional[float] = None
	ev_max_v2x_energy_request: Optional[float] = None

Serializing objects with attributes that have 'v2x' in the name, are not serialized correctly. E.g. V2XChargeParametersType.ev_max_v2x_energy_request is serialized as "evMaxV2xEnergyRequest", but it should be "evMinV2XEnergyRequest". This problem happens also to other objects.

[Jared-Newell-Mobility]

Currently this test replicates it:

`@dataclass
class Bidirectional:
ev_min_v2x_energy_request: Optional[str] = None

def test_serialise():

expected = {'evMinV2XEnergyRequest': None}

assert snake_to_camel_case(asdict(Bidirectional())) == expected`

{'evMinV2xEnergyRequest': None} != {'evMinV2XEnergyRequest': None)

[Jared-Newell-Mobility]

PR #522 is prepared for inclusion in v1.0.0