Update PhysicsShapeCache.java

[DinoBonBino]

Add Disposable interface

[CodeAndWeb]

Hm... I tried to find some information about the compatibility of this interface can could not find any useful information. It's not standard JAVA as I see it.

There seem to be different implementations - e.g. LibGDX has its own variant: https://github.com/libgdx/libgdx/blob/master/gdx/src/com/badlogic/gdx/utils/Disposable.java

So it's probably not a good idea to add the interface.