Release 0.3.2

Fixed

• Cleanup dangling references to removed items. When draggables, droppables or
  sensors removed, clean up dangling references to them in the state (such as
  'active' or 'previous' values). This helps prevent potential infinite recursion
  (such as in onDragEnd) where an item (like a draggable) oscillates between
  having a valid 'previous' value reference and undefined.