v1.2.12

Migration from google drive to github release for downloading pre-trained checkpoints

• Due to instability of gdown module, we changed default download method to wget
• Please remove config.yaml from $HOME/.transparent_background folder before upgrading to this release.
• Also consider downloading checkpoint files from this release page if problem persists. Download and move .pth files to $HOME/.transparent_background.

Full Changelog: 1.2.9...1.2.12