Organize CHANGELOG for upcoming release. (#425)
Organize CHANGELOG for upcoming release. (#425)

- Organized items into Added/Changed/Fixed sections.
- Added **BREAKING** labels.
- Removed items that are only relevant for internal development. I think we should only include things directly relevant to users.
- Mentioned the new READMEs.
- Re-phrased some items for clarity.
- Added PR numbers so users can get more info.

material-components/material-web,material-components/material-web