5.1.0 (2021-04-16)

Bug Fixes

• do not allow signals in value refs value (#7363) (2fbe4b1)
• Remove from Value to fix TopLevelSpec consumed by code using strict mode. (#7352) (9de2b42)

Features

• add locale config (#7305) (98ca975), closes #6630
• support images on maps (#7296) (1dc77d4)
• upgrade Vega to 5.20 (#7312) (2dff36f)
• use latest es version (#7266) (275b53d)