Release v0.6.0

• Added: audonnx.Function
• Added: audonnx.Model.labels()
• Added: arguments
  concat,
  outputs,
  squeeze
  to audonnx.Model.__call__()
• Added: tests on Windows
• Added: audonnx.testing module
• Changed: optionally init audonnx.Model from proto object instead of ONNX file
• Changed: dynamic axis can be specified as None in ONNX graph
• Changed: support output nodes where last dimension is dynamic
• Deprecated: argument output_names of audonnx.Model.__call__()
audonnx.Model.forward()
audonnx.Model.labels,
  audonnx.Model.predict(),
  audonnx.Model.transform
audonnx.InputNode,
  audonnx.Model.__call__(),
  audonnx.Model.inputs,
  audonnx.Model.outputs,
  audonnx.OutputNode
• Changed: make audonnx.Model serializable
  audonnx.Model.forward()
audonnx.Model.labels,
  audonnx.Model.predict(),
  audonnx.Model.transform
audonnx.Model.input_node,
  audonnx.Model.input_shape,
  audonnx.Model.input_type,
  audonnx.Model.output_nodes,
  audonnx.Model.output_shape,
  audonnx.Model.output_type,