Version 0.5.1

• Fixes issue with PyPI.

Version 0.5.0

• Adds functions to dereference relationships.
• Adds a function to get an object's type from its ID.
• Reorganizes DataStore api, renaming: stix2.sources to stix2.datastore.
• Fixes various bugs involving CustomMarking, creating new versions of objects with custom properties, and a missing IntrusionSet property.
• Drops Python 3.3 support.

Version 0.4.0

• Adds creator_of function to easily get the Identity that created an object, and a serialize function for fast serialization without sorting properties.
• Fixes bugs with DataStores and with adding custom STIX content to Bundles.
• Supports filtering on any property, not just common properties.
• Includes internal changes to make it easier to support multiple versions of the STIX specification.

Version 0.3.0

• Adds data stores, object factory, and the environment layer.
• Supports pattern expressions and data markings.
• Fixes some bugs with timestamp precision and parsing of bundles.
• Includes support for custom object types, custom properties, custom observable objects, and custom observable extensions.

Version 0.2.0

• Adds a TAXII data source.

Version 0.1.0

• Include support for serializing/deserializing all STIX objects and Cyber Observable objects.
• Markings are supported but not validated.

Version 0.0.1

• First packaged version
• Supports all SDOs, Relationships, Bundle (not Sightings).
• Limited support for Cyber Observables objects
• Does not support markings.