message: fix missing field in bootstrap schema
diff: @@ -223,6 +223,13 @@ const models = [
  'field-type': '@cardstack/core-types::type'
  }
  },
  + {
  + type: 'fields',
  + id: 'types',
  + attributes: {
  + 'field-type': '@cardstack/core-types::has-many'
  + }
  + },
  {
  type: 'fields',
  id: 'who',
  