message: ts: add onload in ZImage option
diff: @@ -26,7 +26,8 @@ class ImageStyleOption extends StyleOption {
  }
  interface ZImageOption extends DisplayableOption {
  - style?: ImageStyleOption
  + style?: ImageStyleOption,
  + onload?: (image: ImageLike) => void
  }
  export default class ZImage extends Displayable<ZImageOption> {
  