fix: remove recvWindow from exchange_info wrapper

Binance exchangeInfo endpoint does not accept recvWindow, causing
RuntimeError when calling opportunity scan or any command that hits
exchange_info().

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "coinhunter"
-version = "2.0.7"
+version = "2.0.8"
 description = "Binance-first trading CLI for balances, market data, opportunity scanning, and execution."
 readme = "README.md"
 license = {text = "MIT"}