message: add IPraguePackage removal to BREAKING.md
diff: - [MergeTree Client No Longer Public on Sequence](#MergeTree-Client-No-Longer-Public-on-Sequence)
  - [`.createValueType` replaces third argument to `.set`](#.createValueType-replaces-third-argument-to-.set)
  - [Package rename](#package-rename)
  +- [Support for IPraguePackage removed](#support-for-IPraguePackage-removed)
  ## `@fluid-example/tiny-web-host` prague -> fluid changes
  @@ -154,6 +155,22 @@ old name | new name
  @prague/auspkn | @fluid-internal/auspkn
  @prague/service | @fluid-internal/server-service
  +## Support for IPraguePackage removed
  +Support for IPraguePackage and the `"prague"` entry in `package.json` has been removed. It has been replaced by IFluidPackage and a `"fluid"` entry in `package.json`:
  +
  +```
  +"fluid": {
  + "browser": {
  + "umd": {
  + "files": [
  + "dist/main.bundle.js"
  + ],
  + "library": "main"
  + }
  + }
  + },
  +```
  +
  # 0.9 Breaking Changes (August 26, 2019)
  - [PrimedComponent root is now a SharedDirectory](#primedcomponent-root-is-now-a-shareddirectory)
  