Updated release notes

Docs/APIChanges.md

@@ -4,6 +4,10 @@ This document lists all breaking API changes by date and by release tag. Note th
 
 Changes that make some state saved through SaveBinaryState from a prior version of the library unreadable by the new version is marked as *SBS*. See [Saving Shapes](https://jrouwe.github.io/JoltPhysics/#saving-shapes) for further information.
 
+## Changes between v5.2.0 and latest
+
+* 20241119 - Removed the use of std::unordered_map and std::unordered_set and replaced them with our own implementation: UnorderedMap and UnorderedSet. The public facing interface includes some instances of these, e.g. Shape::ShapeToIDMap. Since these are typedeffed and the interface remained the same, applications should not notice the change. (f1420822d39c440492602b670eac8ae2f5821401)
+
 ## Changes between v5.1.0 and v5.2.0
 
 * 20240927 - PhysicsStepListener::OnStep now takes a single PhysicsStepListenerContext parameter. The old parameters 'delta time' and 'physics system' are part of this context. The VehicleConstraint step callbacks use the same context. (8153cd854ce0547b2def425118e1e2f68a9e365c)

Docs/ReleaseNotes.md

@@ -2,6 +2,19 @@
 
 For breaking API changes see [this document](https://github.com/jrouwe/JoltPhysics/blob/master/Docs/APIChanges.md).
 
+## Unreleased changes
+
+### New functionality
+
+* Optimized creation of MeshShape. Improves build speed by about 25% and reduces number of allocations by a factor of 1000. Allocations caused contention when building meshes from multiple threads.
+* Removed the use of std::unordered_map and std::unordered_set and replaced them with our own implementation: UnorderedMap and UnorderedSet.
+* Added MotionProperties::ScaleToMass. This lets you easily change the mass and inertia tensor of a body after creation.
+* Split up Body::ApplyBuoyancyImpulse into Body::GetSubmergedVolume and Body::ApplyBuoyancyImpulse. This allows you to use the calculated submerged volume for other purposes.
+
+### Bug fixes
+
+* Fixed bodies gaining more energy than intended due to restitution. E.g. A restitution of 1 could lead to bodies bouncing ever higher.
+
 ## v5.2.0
 
 ### New functionality