Change type of trigger binding (feature request)

[boozook]

Will be great to change counter: Binding<Int> to trigger: Binding<Any> where Any can by generic parameter or really Any. I'm sure that it's reasonable because:

1. We're need to know that wrappedValue just changed, not the value exactly
2. The type Binding<Int> enforces user to have binding of this type only, specially for this case
3. There are no breaking changes.