datetime type don't respect the specs

[gmeriaux]

This issue is similar to this which was closed for inactivity : https://github.com/frictionlessdata/tableschema-java/issues/62

I notice that in the spec https://specs.frictionlessdata.io/table-schema/#types-and-formats : datetime MUST be in ISO 8601 format of YYYY-MM-DDThh:mm:ssZ in UTC time. When I look in DatetimeField, I am seeing : formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSZ") I think you have to replace it by formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss[.SSS]Z") milliseconds are optionnal in the ISO 8601 standard

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