physics substeps in what's new

dist/preview release/what's new.md

@@ -105,6 +105,7 @@
 - Update Ammo.js library to allow your own broadphase overlapping pair cache ([MackeyK24](https://github.com/MackeyK24/))
 - Update Ammo.js library for custom impostor shapes. PhysicsImpostor.CustomImposter type and AmmoJSPlugin.OnCreateCustomShape factoty function ([MackeyK24](https://github.com/MackeyK24/))
 - Update Ammo.js library and AmmoJS plugin to support ellipsoid ([CedricGuillemet](https://github.com/CedricGuillemet/))
+- Physics update substeps ([CedricGuillemet](https://github.com/CedricGuillemet))
 
 ### Loaders