set the min props in checkboxgroup. And checkboxgroup will add value in checkList when repeatedly
click the selected checkbox

* feat(helpers): add method to detect iOS version

* feat(helpers): add a variable to determine whether it is iOS environment

* feat(bscroll): set the default value of variable use-transition

* fix(picker): fix the scrolling problem in iOS13.4 webview

* fix(scroll): fix the scrolling problem in iOS13.4 webview

* docs(ios13.4): added default description of better-scroll parameter

Bumps [codecov](https://github.com/codecov/codecov-node) from 3.0.4 to 3.6.5.
- [Release notes](https://github.com/codecov/codecov-node/releases)
- [Commits](https://github.com/codecov/codecov-node/commits)
Signed-off-by: Ndependabot[bot] <support@github.com>

submitAlwaysValidate to control validate always when submit