error: convertion from std::io::Error added

src/error.rs

@@ -66,3 +66,9 @@ impl From<std::io::Error> for Error {
         Self::Io(err.kind())
     }
 }
+
+impl From<Error> for std::io::Error {
+    fn from(err: Error) -> std::io::Error {
+        std::io::Error::other(err.to_string())
+    }
+}