***$core:** add `--open` argument to open browser automatically (close: [#1100](https://github.com/vuejs/vuepress/issues/1100))([#1109](https://github.com/vuejs/vuepress/issues/1109)) ([550317e](https://github.com/vuejs/vuepress/commit/550317e))
***$core:** re-enable behavior of scrolling to anchor link (close: [#1107](https://github.com/vuejs/vuepress/issues/1107))([#1108](https://github.com/vuejs/vuepress/issues/1108)) ([7ad0a42](https://github.com/vuejs/vuepress/commit/7ad0a42))
### Breaking Changes
***$core:** remove `contentLoading` and refine scroll behavior ([#1117](https://github.com/vuejs/vuepress/issues/1117)) ([0a7d85b](https://github.com/vuejs/vuepress/commit/0a7d85b))
- It also fixes the exisitng issues about anchor links. (Refs: [#1113](https://github.com/vuejs/vuepress/issues/1113), [#1016](https://github.com/vuejs/vuepress/issues/1016), [#1011](https://github.com/vuejs/vuepress/issues/1011), [#895](https://github.com/vuejs/vuepress/issues/895))
### Performance Improvements
***$core:** improve ssr performance ([#1068](https://github.com/vuejs/vuepress/issues/1068)) ([1c2aa08](https://github.com/vuejs/vuepress/commit/1c2aa08))
