**Features**
251 268 Extensibility mechanism and Groups API extension
270 Enabled DFv2 by default, logged a deprecation notice when DFv1 used
**Dependency upgrades**
264 265 Upgraded openapi generator and re-generated api and models classes from swagger specs
272 Upgraded urllib3, pyyaml
**Documentation**
267 Provided example to import message with attachment
269 Updated PyPI package name in the getting started guide