UnderWater: Allow float input

Signed-off-by: martinRenou <[email protected]>

Author: martinRenou

ipygany/ipygany.py

@@ -491,7 +491,7 @@ class UnderWater(Effect):
 
     _model_name = Unicode('UnderWaterModel').tag(sync=True)
 
-    input = Union((Tuple(trait=Unicode, minlen=2, maxlen=2), Unicode())).tag(sync=True)
+    input = Union((Tuple(trait=Unicode, minlen=2, maxlen=2), Unicode(), CFloat(0.))).tag(sync=True)
 
     default_color = Color('#F2FFD2').tag(sync=True)
     texture = Instance(Image, allow_none=True, default_value=None).tag(sync=True, **widget_serialization)