message: add the type of props in typescript definitions
diff: @@ -42,6 +42,7 @@ export declare class Vue {
  readonly $slots: { [key: string]: VNode[] };
  readonly $scopedSlots: { [key: string]: ScopedSlot };
  readonly $isServer: boolean;
  + $props: Object;
  $mount(elementOrSelector?: Element | String, hydrating?: boolean): this;
  $forceUpdate(): void;
  