Fix over-indentation in exceptions.py
Fix over-indentation in exceptions.py

Signed-off-by: Toby Harradine <acbb377a00596a75b70fba55ca7ed603ecd86ffb@gmail.com>

pengutronix/aiohttp-json-rpc,pengutronix/aiohttp-json-rpc,pengutronix/aiohttp-json-rpc