update dispense amount to minimum 50, remove that it must be multiple of 100

README.md

@@ -188,7 +188,7 @@ Dispense water with specified amount and carbonation level.
 **Parameters:**
 
 - `device_id` (required): The Blanco Unit device to dispense water from
-- `amount_ml` (required): Amount of water in milliliters (100-1500, must be multiple of 100)
+- `amount_ml` (required): Amount of water in milliliters, min 50ml
 - `co2_intensity` (required): Carbonation level
   - `1` = Still water
   - `2` = Medium carbonation

custom_components/blanco_unit/client.py

@@ -739,10 +739,8 @@ async def dispense_water(self, amount_ml: int, co2_intensity: int) -> bool:
         Raises:
             ValueError: If amount or intensity is invalid.
         """
-        if not (100 <= amount_ml <= 1500):
-            raise ValueError("Amount must be between 100ml and 1500ml")
-        if amount_ml % 100 != 0:
-            raise ValueError("Amount must be a multiple of 100ml")
+        if amount_ml < 50:
+            raise ValueError("Amount must be at least 50ml")
         if co2_intensity not in (1, 2, 3):
             raise ValueError("CO2 intensity must be 1 (still), 2 (medium), or 3 (high)")