Release v0.7.0

• Added: audonnx.device_to_providers()
  to convert device names
  to ONNX runtime providers
• Added: num_workers argument
  to audonnx.Model,
  audonnx.load(),
  and audonnx.testing.create_model().
  Its default value is 1,
  whereas before ONNX runtime
  was selecting all available workers
• Added: session_options argument
  to audonnx.Model,
  audonnx.load(),
  and audonnx.testing.create_model()
  to provide ONNX runtime options