🐛 Fix update of frozen description

Last patches froze the entity description objects so we can't update
them anymore at runtime.

Fix #174

custom_components/aquarea/definitions.py

@@ -398,11 +398,9 @@ def guess_shift_or_direct_and_clamp_min_max_values(
     """
     # FIXME: we assume entity is of type HeishMonNumberEntity. We should find a way to properly use the type system
     if native_value in range1:  # we always favor range1
-        entity.entity_description.native_min_value = min(range1)
-        entity.entity_description.native_max_value = max(range1)
+        entity.set_range(min(range1), max(range1))
     elif native_value in range2:
-        entity.entity_description.native_min_value = min(range2)
-        entity.entity_description.native_max_value = max(range2)
+        entity.set_range(min(range2), max(range2))
     else:
         _LOGGER.warn(
             f"Received value {native_value} for {entity.entity_description.name}. Impossible to know if we are using 'shift' mode or 'direct' mode, ignoring"

custom_components/aquarea/number.py

@@ -58,6 +58,12 @@ def __init__(
         self._attr_unique_id = (
             f"{config_entry.entry_id}-{description.heishamon_topic_id}"
         )
+        self._attr_native_min_value = description.native_min_value
+        self._attr_native_max_value = description.native_max_value
+
+    def set_range(self, min, max) -> None:
+        self._attr_native_min_value = min
+        self._attr_native_max_value = max
 
     async def async_set_native_value(self, value: float) -> None:
         _LOGGER.debug(