v0.2.1a2

Added

• docker/pull script for downloading Docker images
• GitHub issue and PR templates
• script/notebook to run Jupyter notebooks (#174)

Fixed

Changed

• Bumped pystac to v1.0.0
• Restructured the Docker build
• Using GitHub Docker Registry rather than DockerHub for storing images
• Use both PySTAC and STAC version in version command (#149)

Removed

• Dropped support for Python 3.6