Add "side" parameter to custom_stake_amount

freqtrade/templates/subtemplates/strategy_methods_advanced.j2

@@ -12,12 +12,11 @@ def bot_loop_start(self, **kwargs) -> None:
     """
     pass
 
-def custom_stake_amount(self, pair: str, current_time: 'datetime', current_rate: float,
+def custom_stake_amount(self, pair: str, current_time: datetime, current_rate: float,
                         proposed_stake: float, min_stake: float, max_stake: float,
-                        **kwargs) -> float:
+                        side: str, **kwargs) -> float:
     """
-    Customize stake size for each new trade. This method is not called when edge module is
-    enabled.
+    Customize stake size for each new trade.
 
     :param pair: Pair that's currently analyzed
     :param current_time: datetime object, containing the current datetime
@@ -25,6 +24,7 @@ def custom_stake_amount(self, pair: str, current_time: 'datetime', current_rate:
     :param proposed_stake: A stake amount proposed by the bot.
     :param min_stake: Minimal stake size allowed by exchange.
     :param max_stake: Balance available for trading.
+    :param side: 'long' or 'short' - indicating the direction of the proposed trade
     :return: A stake size, which is between min_stake and max_stake.
     """
     return proposed_stake