--------------------------
* Added: ``preserve_index`` argument to
``audinterface.Process.process_index()``
and ``audinterface.Feature.process_index()``
* Added: support for Python 3.10
* Changed: speed up processing methods
dealing with multiple files/segments in
``audinterface.Feature``,
``audinterface.Process``,
``audinterface.ProcessWithContext``,
and ``audinterface.Segment``
* Removed: deprecated ``kwargs`` argument
from ``audinterface.Feature``,
``audinterface.Process``,
``audinterface.ProcessWithContext``,
and ``audinterface.Segment``;
use the ``process_func_args`` argument instead