chore: update branch references

Author: yyx990803

README.md

@@ -1,11 +1,11 @@
 # Vuex
 
 [![npm](https://img.shields.io/npm/v/vuex/next.svg)](https://npmjs.com/package/vuex)
-[![ci status](https://circleci.com/gh/vuejs/vuex/tree/dev.png?style=shield)](https://circleci.com/gh/vuejs/vuex)
+[![ci status](https://circleci.com/gh/vuejs/vuex/tree/main.png?style=shield)](https://circleci.com/gh/vuejs/vuex)
 
 ---
 
-:fire: **HEADS UP!** You're currently looking at Vuex 4 branch. If you're looking for Vuex 3, [please check out `dev` branch](https://github.com/vuejs/vuex).
+:fire: **HEADS UP!** You're currently looking at Vuex 4 branch. If you're looking for Vuex 3, [please check out `3.x` branch](https://github.com/vuejs/vuex/tree/3.x).
 
 ---
 
@@ -34,7 +34,7 @@ For questions and support please use the [Discord chat server](https://chat.vuej
 
 ## Issues
 
-Please make sure to read the [Issue Reporting Checklist](https://github.com/vuejs/vuex/blob/dev/.github/contributing.md#issue-reporting-guidelines) before opening an issue. Issues not conforming to the guidelines may be closed immediately.
+Please make sure to read the [Issue Reporting Checklist](https://github.com/vuejs/vuex/blob/main/.github/contributing.md#issue-reporting-guidelines) before opening an issue. Issues not conforming to the guidelines may be closed immediately.
 
 ## Changelog
 
@@ -46,7 +46,7 @@ For latest releases and announcements, follow on Twitter: [@vuejs](https://twitt
 
 ## Contribution
 
-Please make sure to read the [Contributing Guide](https://github.com/vuejs/vuex/blob/dev/.github/contributing.md) before making a pull request.
+Please make sure to read the [Contributing Guide](https://github.com/vuejs/vuex/blob/main/.github/contributing.md) before making a pull request.
 
 ## License
 

docs/guide/hot-reload.md

@@ -38,7 +38,7 @@ if (module.hot) {
 }
 ```
 
-Checkout the [counter-hot example](https://github.com/vuejs/vuex/tree/dev/examples/counter-hot) to play with hot-reload.
+Checkout the [counter-hot example](https://github.com/vuejs/vuex/tree/main/examples/counter-hot) to play with hot-reload.
 
 ## Dynamic module hot reloading
 

docs/ja/guide/hot-reload.md

@@ -38,7 +38,7 @@ if (module.hot) {
 }
 ```
 
-ホットリローディングを試したい場合は、[counter-hot example](https://github.com/vuejs/vuex/tree/dev/examples/counter-hot)をチェックアウトしてください。
+ホットリローディングを試したい場合は、[counter-hot example](https://github.com/vuejs/vuex/tree/main/examples/counter-hot)をチェックアウトしてください。
 
 ## 動的モジュールホットリローディング
 

docs/ptbr/guide/hot-reload.md

@@ -38,7 +38,7 @@ if (module.hot) {
 }
 ```
 
-Confira o [counter-hot example](https://github.com/vuejs/vuex/tree/dev/examples/counter-hot) para brincar com o _hot-reload_.
+Confira o [counter-hot example](https://github.com/vuejs/vuex/tree/main/examples/counter-hot) para brincar com o _hot-reload_.
 
 ## Módulo dinâmico de hot reloading
 

docs/zh/guide/hot-reload.md

@@ -38,7 +38,7 @@ if (module.hot) {
 }
 ```
 
-参考热重载示例 [counter-hot](https://github.com/vuejs/vuex/tree/dev/examples/counter-hot)。
+参考热重载示例 [counter-hot](https://github.com/vuejs/vuex/tree/main/examples/counter-hot)。
 
 ## 动态模块热重载