Merge pull request #44 from macisamuele/maci-fix-imports-to-support-latest-pyo3

Fix json-trait-rs usage of pyo3

Author: macisamuele

src/traits/_pyo3.rs

@@ -6,7 +6,7 @@ use crate::{
 use pyo3::Python;
 use pyo3::{
     types::{PyAny, PyDict, PySequence},
-    ObjectProtocol, PyTryInto,
+    PyTryInto,
 };
 use std::{convert::TryInto, ops::Deref};