v0.13.9

• add useBinding hook (docs)
• add observe method to Observable class (aa94cb7)
• add $T export for overriding the proxy handler of an observable object (3d3c6d6)
• export the ObjectTraps proxy handler (54ea80a)
• use react-batched-updates and remove globals.batchedUpdates (beecc1d)
• use @alloc/queue-microtask (e44694f)