Version 0.8.1

Added support for maxOccurs=unbounded directly in array_fields (aa1c6b4).
Added support for 'abstract': True model option overriding xs:complexType[@abstract] attribute (32b45da).
Added support for xs:all (6f539d5).
Added support for xs:attributeGroup (bd49b55).
Added support for xs:group (0982d0d).
Never generate OneToOneField, it's a wrong thing to do most of the time (1c3da09).
Fixed array_fields with a single-attribute xs:complexType (6083c83).
Fixed primitive type introspection for deep xs:simpleContent/xs:restriction[@base] inheritance (183de02).
Don't output default= model field option when null=True (e060cfb).
Fixed flattening deep xs:complexType/xs:complexContent/xs:extension[@base] inheritance (bac0f5f).
Fixed an assertion when there are only attributes in xs:complexType/xs:complexContent/xs:extension (ce5943b).

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