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

examples/rest/auth/submit_order.py

@@ -2,23 +2,17 @@
 
 import os
 
-from bfxapi import Client, REST_HOST
+from bfxapi import Client
 from bfxapi.types import Notification, Order
-from bfxapi.enums import OrderType, Flag
 
 bfx = Client(
-    rest_host=REST_HOST,
     api_key=os.getenv("BFX_API_KEY"),
     api_secret=os.getenv("BFX_API_SECRET")
 )
 
 # Submit a new order
 submit_order_notification: Notification[Order] = bfx.rest.auth.submit_order(
-    type=OrderType.EXCHANGE_LIMIT,
-    symbol="tBTCUST",
-    amount=0.015,
-    price=10000,
-    flags=Flag.HIDDEN + Flag.OCO + Flag.CLOSE
+    type="EXCHANGE LIMIT", symbol="tBTCUST", amount=0.015, price=10000
 )
 
 print("Submit order notification:", submit_order_notification)
@@ -27,16 +21,12 @@ order: Order = submit_order_notification.data
 
 # Update its amount and its price
 update_order_notification: Notification[Order] = bfx.rest.auth.update_order(
-    id=order.id,
-    amount=0.020,
-    price=10150
+    id=order.id, amount=0.020, price=10150
 )
 
 print("Update order notification:", update_order_notification)
 
 # Cancel it by its ID
-cancel_order_notification: Notification[Order] = bfx.rest.auth.cancel_order(
-    id=order.id
-)
+cancel_order_notification: Notification[Order] = bfx.rest.auth.cancel_order(id=order.id)
 
 print("Cancel order notification:", cancel_order_notification)