use Config typing in more places

freqtrade/rpc/discord.py

@@ -1,6 +1,6 @@
 import logging
-from typing import Any, Dict
 
+from freqtrade.constants import Config
 from freqtrade.enums import RPCMessageType
 from freqtrade.rpc import RPC
 from freqtrade.rpc.webhook import Webhook
@@ -10,7 +10,7 @@ logger = logging.getLogger(__name__)
 
 
 class Discord(Webhook):
-    def __init__(self, rpc: 'RPC', config: Dict[str, Any]):
+    def __init__(self, rpc: 'RPC', config: Config):
         # super().__init__(rpc, config)
         self.rpc = rpc
         self.config = config