Note for custom component developers: We are moving to a new file structure. Platforms now live embedded in components. Custom platforms will have to be updated to follow this pattern. This is a breaking change in case your custom platform overrides a built-in platform. Rename your custom platform from, ie light/hue.py to hue/light.py.
from the beta release notes:
https://rc--home-assistant-docs.netlify.com/blog/2019/02/13/release-88/