Call each different news handler once (#694)

* Call each different news handler once

* if instead of get default

Author: gnvk

alpaca_trade_api/stream.py

@@ -573,15 +573,15 @@ async def _dispatch(self, msg):
             if not symbols:
                 symbols.append('*')
 
+            handlers = set()
             for symbol in symbols:
                 handler = self._handlers['news'].get(symbol)
                 if handler is None:
                     handler = self._handlers['news'].get('*')
-
                 if handler is not None:
-                    await handler(self._cast(msg_type, msg))
-                    # For a single message, only call the handler once
-                    break
+                    handlers.add(handler)
+            for handler in handlers:
+                await handler(self._cast(msg_type, msg))
         else:
             await super()._dispatch(msg)