fix python windows instructions
- Go to `bindings/python/native`
- `$ cargo build --release`
- The built library is located in `target/release/`
-- On MacOS, rename `libiota_client.dylib` to `iota_client.so`, on Windows, use `iota_client.dll` directly, and on Linux `libiota_client.so` to `iota_client.so`.
+- On MacOS, rename `libiota_client.dylib` to `iota_client.so`, on Windows, rename `iota_client.dll` to `iota_client.pyd`, and on Linux `libiota_client.so` to `iota_client.so`.
- Copy your renamed library to `bindings/python/examples/`
- Go to `bindings/python/examples`
- `$ python example.py`
