fix(cascader-panel): value can be falsy value element-plus#1531 (elem…

…ent-plus#1533)

feat(carousel): add pause-on-hover prop (element-plus#1423)

* feat(carousel): add pause-on-hover prop

* feat: add jest

chore: update changelog

fix: fix dropdown/select/picker popper position error when has line-h…

…eight (element-plus#1349)

* fix(dropdown): fix dropdown popper position error when has line-height

* fix(date-picker): fix picker popper position error when has line-height

- xxx-picker

* fix(select): fix select popper position error when has line-height

* refactor(button): adjust height to meet standards

chore: update changelog

chore: update changelog

chore: update changelog

chore: update

chore: update changelog

chore: update changelog