Add support for conversion to pyo3::PyErr (#47) * Added convertion to pyo3::PyErr gated behind feature flag * Added test_pyo3 * fix ci to not test unsupportable feature msrv * fix rustfmt Co-authored-by: Jane Lusby <jlusby@yaah.dev>

Created by  Ryan Butler  on January 5, 2021
C27KPBKKDMVRQUNGEP4TKU4ITMFAWXRZR3HYSPWNEPFVBJXNCC3QC
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