message: fix(types): allow symbol &  boolean for vnode key
diff: @@ -20,7 +20,7 @@ export interface VNode {
  elm?: Node;
  ns?: string;
  context?: Vue;
  - key?: string | number;
  + key?: string | number | symbol | boolean;
  componentOptions?: VNodeComponentOptions;
  componentInstance?: Vue;
  parent?: VNode;
  