If you are upgrading from version 2.8 and below please read the release notes of version 2.9 before upgrading as you will need to clean up a bit of code in the YAML. Click Here to see version 2.9 release notes. If you are updating from version 2.9 and above you good to go.
New Features 
- Transitions will now work with scenes. Now it will transition a light entity with a brightness setting in a scene.
Bugs Fixes 
- Fixed light flicker when crossing over from normal lights to night lights and from night lights to normal lights in a time trigger. Note: For the crossover to work only entities can be selected. Currently areas and or devices are not supported.
EDIT: If you updated in the first 35 min of this release, please update again, something (a bug) snuck back into the code. Sorry
Enjoy
Blacky 