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Pyo3のPythonバインディングをオプションにする

[dependencies]
pyo3 = { version = "0.19.0", optional = true, features = ["extension-module"] }
[features]
default = []
python = ["pyo3"]
[dependencies]
pyo3 = { version = "0.19.0", optional = true, features = ["extension-module"] }
[features]
default = []
python = ["pyo3"]