minor edit to examples/py/async-balance.py
minor edit to examples/py/async-balance.py

aiueogawa/ccxt,ccxt/ccxt,ccxt/ccxt,ccxt/ccxt,tritoanst/ccxt,tritoanst/ccxt,ccxt/ccxt,aiueogawa/ccxt,aiueogawa/ccxt,aiueogawa/ccxt,tritoanst/ccxt,tritoanst/ccxt,ccxt/ccxt