Add change log for removal of TryExecute from filters

docs/changelog/filter-no-try-execute.md

+# Remove TryExecute from filter
+
+[A recent change to dispatchers](dispatcher-auto-device.md) has embedded a
+`TryExecute` internally within the `Invoke` function of all dispatchers. This
+means that it is no longer necessary to specify a device when invoking a 
+worklet.
+
+Previously, this `TryExecute` was in the filter layer. The filter superclasses
+would do a `TryExecute` and use that to pass to subclasses in methods like
+`DoExecute` and `DoMapField`. Since the dispatcher no longer needs a device
+this `TryExecute` is generally unnecessary and always redundant. Thus, it has
+been removed.
+
+Because of this, the device argument to `DoExecute` and `DoMapField` has been
+removed. This will cause current implementations of filter to change, but it
+usually simplifies code. That said, there might be some code that needs to be
+wrapped into a `vtkm::cont::ExecObjectBase`.
+
+No changes need to be made to code that uses filters.