What problem does this feature solve?

I suggest the official make these changes to enhance typescript support.

Now developeres still have a bad experience using typescript

• let @vue/cli-plugin-typescript Support Typescript 3.6

  Now Typescript3.6 stiill marked as unsupport version

• update @vue/eslint-config-typescript dependecies as @typescript-eslint V2 now fullly support vue.

  See #1083
  @vue/eslint-config-typescript still use V1 version and it contain bugs and conflicts with prettier and other eslint plugins