SerializerOptions not passed down in PositionConverter.Read #18

Hi,

Just noticed an issue with PositionConverter. Whenever the coordinates list contains [-Infinity] or any other string literals, the converter throws an exception.
In out code, we do pass SerializationOptions with NumberHandling=JsonNumberHandling.AllowNamedFloatingPointLiterals; but since it's not passed along in PositionConverter.Read(), the deserialization fails when encountering string literals.

Here:

Fix is simple, just pass the converter as a param of JsonSerialzier.Deserialize(double[]))(ref reader, options);

Cheers,
Laura