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Bugfixes
- Fix, primitive extension was not included if primitive field value is null. [nazrulworld]
- Issue `101 ElementDefinition.id typing is incorrect <https://github.com/nazrulworld/fhir.resources/issues/101>`_
Improvements
- Issue `97 <https://github.com/nazrulworld/fhir.resources/issues/97>`_ Now null value accepted as a member of String List.
- Primitive DataType `Ùrl`` is now accepting relative path.
Breaking
- ``Element.id`` & ``Resource.id`` don't have any extension. See https://chat.fhir.org/#narrow/stream/179166-implementers/topic/Resource.2Eid.20and.20primitive.20extension.