* update CI for pip 20.3

* fixed 1.6 torchvision

* delete python 3.8

* fixed mmcv

* add cuda home

* change to 1.2.2

* add pip upgrade

* install cuda for all

* add missing mmcv

* switch to deprecate

* [Improvement] Add markdown linter and fix linting errors

* fixed pip

* Fixed voc aug convert

* update getting_started.md

* add class balanced doc

* add pypi deployment

* remove useless jobs

* fixed typo and cleanup

* delete build.tx

* add change log

Co-authored-by: Jiarui XU <xvjiarui0826@gmail.com>