Workaround for apprise tag detection

Our coins representation became an open html tag by the
recent apprise version's opinion. We should retreat.

binance_trade_bot/models/coin.py

@@ -20,7 +20,7 @@ def __add__(self, other):
         raise TypeError(f"unsupported operand type(s) for +: 'Coin' and '{type(other)}'")
 
     def __repr__(self):
-        return f"<{self.symbol}>"
+        return f"[{self.symbol}]"
 
     def info(self):
         return {"symbol": self.symbol, "enabled": self.enabled}