chore: update README.md (#760)

Author: isaac-mason

packages/react-three-rapier/readme.md

@@ -3,7 +3,7 @@
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-📣 @react-three/rapier v2 has been released, which adds support for @react-three/fiber v9 and react 19. If you are using react 18, you will need to use @react-three/rapier v1 and @react-three/fiber v8.
+📣 @react-three/rapier v2 has been released, which adds support for @react-three/fiber v9 and react v19. If you are using react v18, you will need to use @react-three/rapier v1 and @react-three/fiber v8.
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