Update README.md

Update README.md

Update README.md

Update README.md

Update README.md

fix typo

update readme.md

update readme.md

update readme.md

fix typos

Update requirements.txt

Merge pull request #1 from OpenGVLab/dependabot/pip/torch-1.13.1

Bump torch from 1.8.0+cu111 to 1.13.1

fix intro

fix intro