* Timeline: add timeline component

* Timeline: add timeline component

* Timeline: add test case

* Timeline: fix icon class

* Timeline: update docs

* Timeline: fix test case

* Timeline: remove pending attribute

* Timeline: fix docs

* Timeline: make reverse default to false

* Timline: fix test case

* Timeline: update element-ui.d.ts

* Timeline: optimize code

* Chore: upgrade webpack@4

* Chore: upgrade to webpack@4

* Chore: add babel-preset-stage-2

* Chore: fix test case

* Chore: upgrade webpack@4

* Docs: update docs

* Docs: update docs

* Chore: fix coveralls

* Chore: update yarn.lock

* fix #12513

* fix: fallback for autoComplete and print deprecated warning

* fix: fix auto-complete property in select component

* fix default complete value

* Docs: Update document for autocomplete property change

* Docs: remove redundant documents

* remove unnecessary console log message\

* Update select.md

* fix: add missing declaration in select.d.ts

选中submenu下的菜单，submenu没有激活样式式象错误

Makes it possible to style the height of ".el-time-spinner__item". 
Removed the fixed values associated to a height and line-height: 32px. It's now possible to set whichever height a user wants and the scrollbar will adjust itself accordingly.

watch.value will keep firing during time picker selection
it now detects whether panel is closed before firing el.form.change

* date-picker: refactor type='dates'

fix issue #12323
{month, year} table highlights all selected dates
nuke selectedDates to provide cleaner data flow

* doc: correct date-picker's array usage

empty value must be falsy (empty array should not be used)

* Changelog: update for 2.4.6

* update changelog

* Pagination: make page-size attribute supports .sync

* Update pagination.js

* Tree: register node after dragging

* update Tree docs

* Input: not trigger validation when input

* InputNumber: update docs

* MessageBox: fix ElMessageBoxOptions.message

* Tree: fix type definition