Rewrite all websocket examples according to v3.0.0b3's changes.

examples/websocket/auth/wallets.py

@@ -1,19 +1,18 @@
 # python -c "import examples.websocket.auth.wallets"
 
 import os
-
 from typing import List
 
 from bfxapi import Client
-from bfxapi.enums import Error
 from bfxapi.types import Wallet
 
 bfx = Client(
     api_key=os.getenv("BFX_API_KEY"),
     api_secret=os.getenv("BFX_API_SECRET"),
-    filters=["wallet"]
+    filters=["wallet"],
 )
 
+
 @bfx.wss.on("wallet_snapshot")
 def on_wallet_snapshot(wallets: List[Wallet]):
     for wallet in wallets:
@@ -21,8 +20,10 @@ def on_wallet_snapshot(wallets: List[Wallet]):
         print(f"Available balance: {wallet.available_balance}")
         print(f"Wallet trade details: {wallet.trade_details}")
 
+
 @bfx.wss.on("wallet_update")
 def on_wallet_update(wallet: Wallet):
     print(f"Wallet update: {wallet}")
 
+
 bfx.wss.run()