message: Fixes isBuiltInComponent check.
  Previously it detected components which included built-in component tags as substrings. E.g. it detected 'my-transition-component' as a built-in.
diff: @@ -415,7 +415,7 @@ export const isBuiltInComponent = (vnode: Object): boolean => {
  const tag = vnode.componentOptions.tag;
  - return /keep-alive|transition|transition-group/.test(tag);
  + return /^(keep-alive|transition|transition-group)$/.test(tag);
  };
  export const makeEventsArray = (events: string) => {
  