message: docs: add 4.0 release note
diff: @@ -40,7 +40,7 @@ The current maintenance status of each version of Vant is as follows:
  | Name | Framework | Release | Latest Version | Status |
  | --- | --- | --- | --- | --- |
  -| Vant 4 | Vue 3 | `2022.11` | ![](https://img.shields.io/npm/v/vant/latest?style=flat-square) | Under active development |
  +| Vant 4 | Vue 3 | `2022.12` | ![](https://img.shields.io/npm/v/vant/latest?style=flat-square) | Under active development |
  | Vant 3 | Vue 3 | `2020.12` | ![](https://img.shields.io/npm/v/vant/latest-v3?style=flat-square) | Bugfix only |
  | Vant 2 | Vue 2 | `2019.06` | ![](https://img.shields.io/npm/v/vant/latest-v2?style=flat-square) | Bugfix only |
  | Vant 1 | Vue 2 | `2018.03` | ![](https://img.shields.io/npm/v/vant/latest-v1?style=flat-square) | End of life |
  