chore: add changelog

Author: haoqunjiang

CHANGELOG.md

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+# 4.0.1
+
+* [#3961](https://github.com/vuejs/vue-cli/pull/3961) airbnb lint should not warn on vuex state mutation ([@LinusBorg](https://github.com/LinusBorg))
+
+# 4.0.0
+
+### Chore
+
+* update base configs ([683018e](https://github.com/vuejs/vue-cli/commit/683018e))
+
+### Features
+
+* update to ESLint v5 ([7ccf7b3](https://github.com/vuejs/vue-cli/commit/7ccf7b3)), closes [#2322](https://github.com/vuejs/vue-cli/issues/2322) [#2704](https://github.com/vuejs/vue-cli/issues/2704)
+
+### BREAKING CHANGES
+
+* now requires eslint v5 as peer dependency