`when_any` runs hook once per field changed

[Maushundb]

Seems like when multiple tracked fields in when_any change, the hook is fired that many times, rather than once as one would expect. #8 seems to address this but isn't merged.

class MyModel(LifecycleModelMixin, BaseModel):
   ...
    @hook(AFTER_UPDATE, when_any=['foo', 'bar'], has_changed=True)
    def run_hook(self):
       print("hey")
    

model = MyModel()
model.foo = 1
model.bar = 2
model.save()
# prints "hey" twice

This does not appear to be the behavior when when_any is omitted.

[rsinger86]

Ah, nice catch.