2.0.0

This release updates stac-pydantic to work with STAC 1.0.0

• Update to stac version 1.0.0 (#86, @moradology)
• Add Collections model (#81, @moradology)
• Remove models for STAC spec extensions (#86, @moradology)
• Add conformsTo to LandingPage (#90, @moradology)