Add changelog

Documentation/release/dev/cell-locators-tolerance.md

+## CellLocators: Make sure that when a tolerance parameters is available it can be used
+
+`vtkCellLocator`, `vtkStaticCellLocator`, `vtkCellTreeLocator`, `vtkModifiedBSPTree`, `vtkOBBTree` have the following
+functions that has a tolerance parameter, but it was not used in the implementation. Now it is used.
+
+1. `InsideCellBounds`
+2. `IntersectWithLine`
+3. `FindCell`
+4. `FindCellsAlongLine`
+5. `FindCellsAlongPlane`