use more granular msg dict for buy/sell notifications

freqtrade/rpc/rpc_manager.py

@@ -2,9 +2,9 @@
 This module contains class to manage RPC communications (Telegram, Slack, ...)
 """
 import logging
-from typing import List, Dict
+from typing import List, Dict, Any
 
-from freqtrade.rpc.rpc import RPC
+from freqtrade.rpc import RPC
 
 logger = logging.getLogger(__name__)
 
@@ -32,7 +32,7 @@ class RPCManager(object):
             mod.cleanup()
             del mod
 
-    def send_msg(self, msg: Dict[str, str]) -> None:
+    def send_msg(self, msg: Dict[str, Any]) -> None:
         """
         Send given message to all registered rpc modules.
         A message consists of one or more key value pairs of strings.