New Features

• Add href as channel and cursor as a property for marks – (#3229)
• Support for maps (by @willium): See projection, geoshape, and more examples
• Add support for a test predicate in condition. For example, you can make points with null values grey.

JSON Schema Changes

• Filter objects renamed to Predicate #3275

Helper API Changes

• vl.fielddef.field() is renamed to vl.fielddef.vgField()

Bug Fixes and Improvements

• Fix rule mark to support arbitrary (possibly oblique) line segments
• Make sort descending work correctly with header -- Fix #3278
• Make header labelAngle support 0 -- #3273
• Fix issues with independent datasets in faceted charts -- #3287
• Update dependencies

v2.0.4...v2.1.0