message: improve Vue.config.keyCode typing
diff: @@ -11,7 +11,7 @@ export type Config = {
  devtools: boolean;
  errorHandler: ?(err: Error, vm: Component, info: string) => void;
  ignoredElements: Array<string>;
  - keyCodes: { [key: string]: number };
  + keyCodes: { [key: string]: number | Array<number> };
  // platform
  isReservedTag: (x?: string) => boolean;
  parsePlatformTagName: (x: string) => string;
  