message: add support for addPushManifest build option
diff: @@ -65,6 +65,7 @@ function fixDeprecatedOptions(options: any): ProjectOptions {
  export interface ProjectBuildOptions {
  name?: string;
  addServiceWorker?: boolean;
  + addPushManifest?: boolean;
  swPrecacheConfig?: string;
  insertPrefetchLinks?: boolean;
  bundle?: boolean;
  