Merge pull request #11 from kerthcet/feat/add-oss-s3

Add dotenv

Merge pull request #10 from kerthcet/feat/add-oss-s3

Support download_dir

Merge pull request #9 from kerthcet/feat/add-oss-s3

Update Readme.md

Merge pull request #7 from kerthcet/feat/add-oss-s3

Update Readme.md