* feat(upload): target can be a function to get target URL

* feat(upload): checkSuccess support cb

* fix(upload): checkSuccess add the second param file

* test(upload): target and checkSuccess test

* docs(upload): target[function] and checkSuccess async docs

* feat(upload): headers and data support function too

* docs(upload): add headers & data function doc

* feat(upload): upload component add multiple & accept prop

* docs(upload): add multiple & accept doc

* refactor(input): prepend and append margin style

BREAKING CHANGE: input prepend + input field no margin-left -5px

* feat(input): support blurHidden for clearable prop

#271

* chore(example): input

add clearable blurHidden demo

* test(input): clearable blurHidden test

* feat(input): eye and clearable support deep changes

* test(input): deep watch test

* docs(input): clearable doc

* feat(toast): support only txt show

* test(toast): txt only test

* docs(toast): add only txt doc

* chore(example): toast add only txt demo

* docs(toast): add version required

* feat: nested scrolls

* docs(scroll): add nest scroll introduce

* feat: minute step rule

* docs: chinese

* fix: number value

* test: minuteStep

* docs: update

* fix: min hour change caused by ceil

* test: add case

* feat(time-picker): format #235

* feat(mixins): add new parent minxin creator

* feat(sticky): init sticky component

* feat(scroll-nav-bar): init logic

* feat(scroll-nav): init logic

* feat(modules): add sticky, scroll-nav, scroll-nav-bar

* test(sticky): init tests

* test(scroll-bar-bar): init tests

* test(scroll-nav): init tests

* docs(scroll-nav-bar): init doc

* docs(sticky): init doc

* docs(scroll-nav): init docs

* docs(entry): add sticky, scroll-nav-bar, scroll-nav entries

* chore(package.json): better-scroll to 1.12.4

* chore(yarn): yarn update

* feat(slide): support listenScroll

* feat(tabs): add tabs feature

* docs(tabs): tabs's docs

* test(tabs): tabs' unit case

* chore(tabs): the examples of tabs

* feat(textarea): support indicator config

* chore(example): textarea support indicator config

* test(textarea): support indicator config test

* docs(textarea): add indicator config doc

* fix(textarea): check indicator condition

* feat(ImagePreview): init

#198

* test(image-preview): test cases

* docs(image-preview): finish docs