Records breaking changes from major version bumps
PR: #213
- new notification banner format #211 (breaking change)
- changes to temporary messages example page #212
- separation of temporary message style into placeholder [in
- ability to add pattern-level grids in #212
The base temporary message styles were split out into a placeholder block to allow use across multiple patterns (by extending it):
This means the existing temporary message pattern will break unless the new placeholder block is included in the main stylesheet of apps that use it.